10 Nov, 2026

Secondary Infertility: Why You Can't Get Pregnant Again and What Helps

Reviewed by Dr. Anshika Lekhi, MBBS, DGO, Fellowship in Reproductive Medicine | Infertility Expert, Gurgaon | 13+ Years

Secondary infertility, not being able to conceive or carry a pregnancy to term after an earlier successful birth, is one of the most emotionally tangled situations in fertility care. Couples often feel their struggle counts for less than primary infertility. In reality, secondary infertility affects around 11% of couples who've already had a baby, and it deserves the same care and attention as any other fertility problem.

What Causes Secondary Infertility?

It develops when something changes between the first pregnancy and trying again. The causes are the same as for primary infertility, but a few matter more here.

Age and Ovarian Reserve Decline

Most often, it's simply time. If your first child came when you were 30 and you're trying again at 36, your ovarian reserve has dropped noticeably. ASRM data shows egg numbers and quality fall sharply from the mid-30s, so conceiving gets harder even if nothing else has changed.

New Structural Issues

The uterus and tubes can be affected by things that happen between pregnancies:

Asherman's syndrome: scar tissue inside the uterus that can form after a D&C for miscarriage or retained placenta, a known but often missed cause
Fibroids or polyps: benign growths that may have appeared or grown since your first pregnancy and now affect the cavity
Endometriosis: it can develop or get worse after a first pregnancy, especially if it was there before and went untreated

Male Factor Changes

Male fertility doesn't stand still. Sperm quality can drop because of:

Getting older (sperm quality falls from the late 30s)
New health problems like diabetes, high blood pressure or obesity
A varicocele that's developed or got worse
Medicines that affect sperm production
Lifestyle changes, like weight gain, drinking more or moving less

A fresh semen analysis should always be part of the workup, even if an earlier test was normal.

Weight and Lifestyle Factors

Gaining a lot of weight between pregnancies can disrupt ovulation, especially for women with PCOS who conceived the first time when their metabolism was in better shape.

How Is Secondary Infertility Investigated?

The workup for secondary infertility follows the same plan as for primary infertility:

Investigation	Purpose
AMH and antral follicle count	Current ovarian reserve, which may differ a lot from years earlier
Day 2 to 3 FSH, LH, oestradiol	Baseline ovarian function
TSH and prolactin	Rule out post-partum thyroid changes
Transvaginal ultrasound	Uterine cavity, ovarian structure, any new fibroids or polyps
Hysteroscopy (if indicated)	Direct assessment and correction of intrauterine pathology
HSG	Tubal patency, particularly relevant after uterine surgery or pelvic infection
Semen analysis	Current sperm parameters for the male partner

Both partners should be tested at the same time. Our female fertility assessment and male fertility assessment cover both sides.

What Are the Treatment Options for Secondary Infertility?

It all depends on what's found. If there's a structural cause, like adhesions or a polyp, fixing it surgically often restores fertility with nothing else needed. If ovarian reserve has dropped, options run from ovulation induction with IUI to IVF, depending on how far it's fallen and your age.

"Secondary infertility is often more distressing for couples than primary infertility. There's a previous pregnancy that feels like evidence that it should work again, and when it doesn't, that creates a particular kind of grief. We take it just as seriously clinically, and I think patients deserve to hear that their situation is valid and worth investigating thoroughly." Dr. Anshika Lekhi, Infertility Expert, TheFertilife

If you've been trying for 12 months without success (6 months if you're 35 or older), get checked, even with a healthy child at home. Secondary infertility often has causes that can be found and treated.

A C-section scar can sometimes leave a niche, a small defect in the uterine wall at the scar, which can affect implantation. It's more likely after several C-sections.

Breastfeeding holds back ovulation by raising prolactin. Once you stop and your cycles come back, fertility returns to normal for most women. If cycles are still irregular 2 to 3 months after stopping, a prolactin and thyroid check is worth doing.

Wait 12 months if you're under 35 with no history that needs earlier checks, or 6 months if you're 35 or older. With past pelvic surgery, irregular cycles or earlier pregnancy complications, get checked sooner.

Severe, long-lasting stress can affect ovulation through cortisol.

Dr. Anshika Lekhi

MBBS | DGO (Obstetrics & Gynaecology) | Fertility & IVF Specialist

13+ Years Experience

The health information on this website is reviewed by Dr. Anshika Lekhi, an experienced Obstetrician, Gynaecologist and Fertility Specialist, to help ensure medical accuracy, relevance, and adherence to current clinical practices. Our goal is to provide reliable educational information that empowers patients while encouraging consultation with qualified healthcare professionals for personalized medical advice.