Your Pregnancy Chances with Irregular Cycles - Obstetrics and Gynecology

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What is the likelihood of me getting pregnant?


Hello, Dr.
Huang! My menstrual cycle has always been irregular.
When my mood is stable, it usually ranges from 32 to 35 days, but sometimes it can be as long as 40 or even over 50 days.
My last period was from September 6 to September 13.
I had intercourse with my boyfriend on February 7 without using a condom for about one or two minutes, but he did not ejaculate inside me.
He tends to last a long time before he ejaculates.
What is the likelihood of me getting pregnant? Thank you!

Zhang Wen, 20~29 year old female. Ask Date: 2017/07/04

Dr. Huang Jianzhong reply Obstetrics and Gynecology


My menstrual cycle has always been irregular.
When my mood is stable, it typically ranges from 32 to 35 days, but sometimes it can be as long as 40 or even over 50 days.
My last period was from September 6 to September 13, and I had intercourse with my boyfriend on February 7 without using a condom for about one to two minutes.
He did not ejaculate inside me, and he tends to last a long time before ejaculation.
Given this, what is the likelihood of pregnancy?
Answer: Since your boyfriend lasts a long time and there was no ejaculation inside, the likelihood of pregnancy should be low.
However, due to your irregular menstrual cycle, it may be difficult to accurately determine ovulation.

Reply Date: 2017/07/04

More Info


Understanding your chances of pregnancy with irregular menstrual cycles can be quite complex, but I will do my best to provide you with a comprehensive overview based on your situation.

Firstly, it’s important to recognize that irregular menstrual cycles can significantly affect ovulation, which is the key factor in determining your chances of becoming pregnant. In a typical cycle, ovulation occurs approximately 14 days before the start of your next period. However, with cycles that vary from 32 to over 50 days, pinpointing the exact time of ovulation can be challenging. This variability can make it difficult to predict fertile windows accurately.

In your case, you mentioned that your cycles range from 32 to 50 days. If we take an average cycle length of about 40 days, ovulation would likely occur around day 26 of your cycle. If you had intercourse on February 7, and your last period started on January 6, you would be in a window where ovulation could potentially occur, depending on the exact timing of your cycle. However, since your cycles are irregular, it’s difficult to ascertain whether you were ovulating at that time.

Regarding the specifics of your sexual encounter, you mentioned that there was no ejaculation inside you, which reduces the likelihood of pregnancy. However, it’s important to note that pre-ejaculate fluid can contain sperm, and while the chances are lower, it is still possible to conceive if sperm is present in that fluid.

In terms of pregnancy rates, studies suggest that the average chance of conception during a single menstrual cycle is about 15-25% for couples trying to conceive, but this can vary widely based on individual factors, including the regularity of cycles and timing of intercourse relative to ovulation. With irregular cycles, this percentage may decrease, as it becomes more difficult to time intercourse with ovulation.

If you are concerned about your irregular cycles and their impact on your fertility, it may be beneficial to consult with a healthcare provider or a fertility specialist. They can offer guidance on tracking ovulation through methods such as basal body temperature charting, ovulation predictor kits, or even ultrasound monitoring. Additionally, they can evaluate any underlying conditions that may be contributing to your irregular cycles, such as polycystic ovary syndrome (PCOS) or hormonal imbalances.

In summary, while there is a possibility of pregnancy given your circumstances, the irregularity of your cycles makes it difficult to predict your chances accurately. If you are actively trying to conceive or are concerned about potential pregnancy, consider seeking medical advice for personalized guidance and support. It’s also advisable to take a pregnancy test if you miss your next period, as this will provide you with a clearer answer regarding your pregnancy status.

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