Irregular Cycles and Fertility

Successful Conception After Hormonal Correction and Ovulation Induction

Patient Profile

Field	Details
Age	27 years
Gender	Female
Occupation	Working Professional
City	Navi Mumbai
Presenting Complaint	Irregular menstrual cycles and difficulty conceiving for 14 months
Diagnosis	PCOS with anovulation and subclinical hypothyroidism
Previous Treatments	No prior fertility treatment; general physician had advised weight management
Date of Procedure	January 2025
Outcome	Successful Natural conception confirmed at 6 weeks after hormonal correction and ovulation induction

Patient identity withheld per confidentiality guidelines. All other details shared with written consent.

The Problem

Condition

This patient was 27 years old, married for just over a year, and had been trying to conceive for fourteen months without success. Her menstrual cycles were irregular, ranging from 35 to 60 days in length, with no consistent pattern. She had not ovulated in at least three of the previous six cycles based on serial ultrasound records from her general physician. Hormonal investigations revealed a raised LH to FSH ratio, elevated androgen levels, and a polycystic morphology on transvaginal ultrasound confirming PCOS. Her TSH was 5.2 mIU/L, indicating subclinical hypothyroidism, which was contributing further to her anovulatory pattern.

Both conditions were treatable. But left unaddressed, they would continue to prevent ovulation and make natural conception unlikely. A Fertility Specialist in Nerul was the right step at this stage to establish a targeted treatment plan rather than continuing general advice without a specialist assessment.

Emotional and Psychological Impact

By the time she consulted Dr. Prajna Shetty, Fertility Consultant at Nerul, Navi Mumbai, this patient had been managing irregular cycles since her mid-teens without fully understanding their clinical significance. After marriage, when conception did not happen, she assumed the cycles were to blame but did not know whether treatment was possible or how soon it should begin.

The uncertainty was compounding the emotional weight. She described a pattern of missed periods followed by anxiety, followed by negative pregnancy tests. Nobody had previously told her that irregular cycles were a signal worth investigating rather than simply waiting on. What she needed was a clear diagnosis, an explanation of how her hormones were affecting ovulation, and a concrete timeline for treatment.

Consultation & Treatment Plan

What Was Assessed During Consultation

Menstrual cycle history: onset of irregularity, frequency, duration, and flow
Transvaginal ultrasound: polycystic morphology confirmed bilaterally, endometrial thickness assessed
Hormonal profile: LH, FSH, AMH, testosterone, DHEAS, SHBG, prolactin, and fasting insulin
Thyroid panel: TSH 5.2 mIU/L, Free T4 within low-normal range
Fasting glucose and insulin resistance markers: mildly elevated fasting insulin, HOMA-IR above threshold
BMI assessment and lifestyle review: BMI 27.4, sedentary work profile, no regular exercise
Partner semen analysis: normal count, motility, and morphology on standard WHO parameters
Uterine cavity assessment: sonohysterography confirmed normal cavity with no structural abnormality

Treatment Approach

The treatment plan was structured in two phases. The first phase addressed the underlying hormonal causes. The second phase focused on achieving ovulation and timed conception. IVF treatment was not the first step in this case. Given the patient’s age, normal partner semen analysis, and structurally normal uterus, the goal was to restore natural ovulation before considering assisted reproduction.

Levothyroxine started to correct subclinical hypothyroidism; target TSH set below 2.5 mIU/L prior to conception
Metformin initiated for insulin resistance with gradual dose titration over four weeks
Dietary modification plan prescribed: low glycaemic index diet, increased protein intake, reduced refined carbohydrates
Structured physical activity introduced: 30 minutes of moderate exercise five days per week
Ovulation induction with letrozole initiated after six weeks once TSH was optimised
Serial follicular monitoring performed from Day 10 of the induced cycle
Trigger injection given when dominant follicle reached 18 mm
Timed intercourse advised 24 to 36 hours post-trigger

Transvaginal ultrasound showing dominant follicle at 18mm during ovulation induction cycle

Procedure Details

Step-by-Step Overview

Baseline investigations completed on Day 2 of cycle after thyroid optimisation at six weeks
Letrozole 2.5 mg prescribed from Day 2 to Day 6 of the induced cycle
Follicular monitoring scan performed on Day 10; dominant follicle 14 mm observed on right ovary
Repeat scan on Day 13; dominant follicle reached 18.4 mm with adequate endometrial thickness of 8.2 mm
Trigger injection administered on Day 13 evening
Timed intercourse advised on Day 14 and Day 15
Luteal phase support started: progesterone pessaries from Day 15 for 14 days
Urine pregnancy test positive on Day 28 of the induced cycle
Beta hCG confirmed positive; early scan at 6 weeks showed intrauterine pregnancy. For reference on how ovulation induction compares to IVF in treatment planning, see the previous case study on IVF for unexplained infertility.

Procedure Summary

Parameter	Details
Hormonal Correction Phase	6 weeks (thyroid optimisation and insulin sensitisation)
Ovulation Induction Drug	Letrozole 2.5 mg, Day 2 to Day 6
Dominant Follicle Size at Trigger	18.4 mm, right ovary
Endometrial Thickness	8.2 mm on trigger day
Trigger Used	hCG trigger injection
Luteal Support	Progesterone pessaries from Day 15
Pregnancy Test	Positive on Day 28 of induced cycle
Complications	None
Assisted Reproduction Required	No

Post-Treatment Results

Positive urine pregnancy test or beta hCG blood report confirming conception

The patient responded well to hormonal correction. TSH normalised to 1.8 mIU/L within six weeks on levothyroxine. Fasting insulin improved with metformin and dietary changes. On the first letrozole cycle, a dominant follicle developed on the right ovary. Trigger was administered when the follicle reached 18.4 mm. A urine pregnancy test on Day 28 of the induced cycle was positive. Beta hCG on Day 30 was 312 mIU/mL, with appropriate doubling confirmed at Day 32. An early scan at 6 weeks confirmed a single intrauterine gestation with fetal cardiac activity present.

Outcomes at a Glance

Outcome Metric	Result	Status
TSH Optimisation	1.8 mIU/L (within pre-conception target)	Achieved
Ovulation Induction	Dominant follicle 18.4 mm, right ovary	Achieved
Endometrial Thickness	8.2 mm on trigger day	Adequate
Conception	Natural conception, first letrozole cycle	Confirmed
Beta hCG Doubling	Confirmed at Day 30 and Day 32	Normal
6-Week Scan	Single intrauterine pregnancy, cardiac activity	Confirmed
Complications	None	Clear

Early pregnancy ultrasound at 6 weeks showing fetal cardiac activity

Patient Feedback

“I had been dealing with irregular periods since I was 16 and nobody had really explained to me what it meant for my fertility. When I came to Dr. Prajna, she sat with me for almost an hour at the first appointment and explained everything about PCOS, my thyroid, and how they were both connected to my cycles not working properly. Within six weeks we were ready to try. The first cycle worked. I still cannot believe it happened that quickly once someone actually treated the root cause.”

Post-Procedure Care & Recovery

Instructions Given to the Patient

Levothyroxine continued through first trimester; TSH to be rechecked at 8 weeks gestation
Metformin continued until 12 weeks gestation per standard PCOS protocol
Progesterone pessaries continued for 12 weeks post-conception
Low glycaemic index diet maintained through first trimester to manage insulin levels
Moderate physical activity continued unless otherwise advised
No NSAIDs during pregnancy; paracetamol only if required
Early pregnancy scan booked at 6 weeks to confirm intrauterine location and cardiac activity
First trimester combined screening booked at 12 weeks

Recovery and Follow-Up Timeline

Timeframe	What to Expect
Week 1 to 6 of treatment	Hormonal correction phase. TSH optimisation, insulin management, and lifestyle changes.
Letrozole cycle Day 2 to 13	Ovulation induction with serial follicular monitoring.
Day 14 to 15	Timed intercourse post-trigger. Luteal support started from Day 15.
Day 28	Urine pregnancy test. Beta hCG to confirm and assess doubling.
6 weeks gestation	Early scan to confirm intrauterine pregnancy and fetal cardiac activity.
8 weeks gestation	TSH recheck. Medication doses reviewed.
12 weeks gestation	First trimester screening. Metformin and progesterone tapered.

FAQs

Q1. Can irregular cycles affect the ability to conceive?

Yes. Irregular cycles often indicate that ovulation is not occurring consistently. Without ovulation, there is no egg available for fertilisation. Conditions such as PCOS, hypothyroidism, and hormonal imbalance are common causes and are treatable once identified.

Q2. What is PCOS and how does it impact fertility?

PCOS is a hormonal condition where the ovaries produce excess androgens, disrupting the normal ovulation cycle. Women with PCOS may ovulate infrequently or not at all. This makes conception difficult without treatment, but ovulation can usually be restored with medication, lifestyle changes, or both.

Q3. How does hypothyroidism affect menstrual cycles and fertility?

Hypothyroidism, even in its subclinical form, can disrupt ovulation and alter cycle regularity. TSH above 2.5 mIU/L is generally treated before conception. Correcting thyroid levels with levothyroxine often improves cycle regularity and conception chances significantly.

Q4. What is ovulation induction and when is it used?

Ovulation induction uses oral medication, typically letrozole or clomiphene, to stimulate the ovaries to develop and release a mature egg. It is used when a woman is not ovulating regularly due to PCOS or hormonal imbalance. It is monitored with serial ultrasound scans and timed with intercourse or insemination.

Q5. How long does it take for irregular cycles to be corrected before trying to conceive?

This depends on the underlying cause. In this case, thyroid optimisation took six weeks before ovulation induction was started. Some patients respond within one to two cycles; others may need adjustment of medications or protocols. A specialist assessment helps set a realistic timeline.