Why Pregnancy Doesn’t Occur Despite Regular Sexual Activity
Every day, women come to my office with the same question: "Why can't I get pregnant?" Over years of practice, I have realized that this question is never just about a medical issue; it represents a deep story of anxiety and hope. This is felt particularly acutely by women over 35. Today, I want to have an honest conversation about the factors behind the absence of pregnancy despite regular sexual activity and, most importantly, what to do about it.
When to Start Worrying: Norms vs. Reality
The first thing I explain to my patients is that while your anxiety is understandable, it is important to establish a clear timeframe. For women under 35, the medical community recommends seeking specialist advice after 12 months of unsuccessful attempts. However, if you are 35 or older, this window shortens to 6 months. After age 40, it is best not to wait more than 3 months before consulting a doctor. Why the difference? Reproductive potential declines with age, and in these situations, losing time is simply not an option.
Let’s look at the numbers objectively. At age 35, the probability of natural conception during a single menstrual cycle is approximately 15–20%. By age 40, this figure drops to 5–10%, and after age 43, the chance of conceiving naturally does not exceed 1–2% per cycle. This does not mean pregnancy is impossible, but these statistics help us understand why time becomes a critical factor. In my practice, I have helped many women aged 38–42 become mothers; each success story proves that age is not a "sentence," but rather a factor to be managed through careful screening and treatment.
The Age Factor and Egg Quality
I’ll start with the most vital point, which many prefer not to dwell on: from birth, every woman has a finite reserve of eggs that is depleted over her lifetime and never replenished. After 35, this reserve begins to diminish significantly faster—and it is not just the quantity that declines, but the quality as well.
What does this mean in practice? Eggs accumulate chromosomal abnormalities, which leads to a lower probability of fertilization and an increased risk of early miscarriage. During an evaluation, I always assess the ovarian reserve using an Anti-Müllerian Hormone (AMH) test and an ultrasound of the ovaries. These tests tell us how much time we have for natural conception attempts.
It is important to understand that even with a diminished reserve, pregnancy is possible. I regularly manage patients who successfully conceive and give birth to healthy children after 40. The key to success lies in timely diagnosis and the right strategy.
Ovulation Disorders and Hormonal Balance
One of the most common causes I see is ovulatory dysfunction. Many women assume that a regular cycle guarantees normal ovulation. Unfortunately, this is not always the case; a cycle can be regular yet anovulatory (lacking an egg release).
Polycystic Ovary Syndrome (PCOS) affects one in ten women and often goes undiagnosed for years. Hypothyroidism, even in subclinical forms, can significantly impact fertility. Elevated prolactin levels can also suppress ovulation. Thyroid dysfunction requires correction as early as the planning stage.
In these cases, I usually begin by normalizing the hormonal profile. Modern treatment protocols allow us to restore ovulation in the majority of patients. It is vital to understand that hormonal issues rarely resolve on their own—they require professional medical correction under a doctor's supervision.
Anatomical Factors: Endometriosis, Fibroids, and Tubal Patency
Structural changes in the reproductive organs are equally important. Endometriosis is diagnosed in one out of every three women with infertility, and often its only symptom is painful menstruation. This condition creates an inflammatory environment that negatively affects egg quality and hinders implantation.
Uterine fibroids, depending on their location, can deform the uterine cavity and prevent implantation. Endometrial polyps, adhesions from previous surgeries, and congenital anomalies can also cause infertility. Furthermore, fallopian tube obstruction—often a result of past inflammatory diseases—makes natural conception impossible.
To diagnose these issues, I utilize pelvic ultrasounds and hysterosalpingography (to check tubal patency), as well as hysteroscopy or laparoscopy when necessary. Modern surgery allows us to restore anatomy in many cases, providing a renewed chance for natural conception.
The Male Factor: Why Evaluation Must Be a Partnership
This is a delicate topic, but I am always direct: in 40–50% of infertility cases, the issue is related to the male factor or is a combined concern. Despite this, many couples spend years testing the woman without checking the simplest variable. A semen analysis (spermogram) is a foundational test that should be performed at the very beginning.
Sperm quality can decline for many reasons: varicocele, infections, hormonal imbalances, toxins, or stress. Sperm quality also diminishes with age. It is important to realize that even if a partner already has children, it does not guarantee there are no issues now.
I always recommend that couples undergo evaluation together. This saves time and provides a complete picture immediately. If abnormalities are found, I refer the partner to a urologist-andrologist. Correcting the male factor often significantly increases the chances of conception.
What to Do: A Clear Action Plan
Now for the most important part: how to move forward. If you are under 35 and have been trying for over a year, or if you are 35 or older and have not conceived within 6 months, you must begin an evaluation. Do not wait and hope it "just happens," because every month lost reduces your odds.
The first stage of evaluation includes:
- Ovulation assessment
- Hormonal profiling
- Pelvic ultrasound
- Partner’s semen analysis
These tests provide a baseline understanding and usually take 1–2 menstrual cycles. Depending on the results, I may order additional tests: tubal patency checks, infection screenings, immunological or genetic tests, or consultations with other specialists.
Once we have all the results, we discuss the options. If there is an opportunity to restore natural fertility (by normalizing ovulation or through surgical correction), we start there. If the situation requires more active intervention, we consider Assisted Reproductive Technologies (ART), such as IUI or IVF. The choice of method is always individual, depending on the specific cause of infertility, age, ovarian reserve, and the amount of time we can afford to spend on attempts.
I want to be honest: I know how emotionally taxing this journey can be. Every negative test and every question from relatives creates immense pressure. However, over years of work, I have seen hundreds of stories where proper diagnosis and treatment led to a long-awaited pregnancy, even in complex cases. The main thing is not to lose time and to seek a specialist who will provide a comprehensive evaluation and the optimal plan for your specific situation.