Determining the Likely Conception Date: A Guide for Expecting Mothers - Obstetrics and Gynecology

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I would like to know which day I conceived?


Hello, my due date is on December 23.
If I remember correctly, my last menstrual period was on March 10, but I'm not entirely sure (it usually comes on the 10th of every month).
I had my last sexual encounter with my ex-boyfriend on February 23, but we broke up that month.
After that, I started a relationship with my current husband, and we have had sexual intercourse since March 14.
I was worried about possibly being pregnant with my ex-boyfriend's child, so I bought a pregnancy test on March 8, which showed negative.
My period on March 10 seemed normal, but since the flow was light, I wasn't sure.
I took another pregnancy test on March 30, which was still negative.
However, my period did not come on April 10, so on April 14, I went to a gynecologist, and the pregnancy test was positive, but I couldn't see anything on the ultrasound.
On April 22, I went for a transvaginal ultrasound, which showed a gestational sac measuring 0.73 mm at five weeks.
I tend to be quite anxious and want to completely rule out the possibility that the child could be my ex-boyfriend's.
Doctor, based on this information, it seems that the child should belong to my current husband, right? I am really anxious every day and seek your clarification.
I have already consulted with a gynecologist, and they said it is impossible for the child to be from my ex-boyfriend, but I still feel uneasy, so I hope you can help me clarify this.
Thank you.

hen jiao lv, 20~29 year old female. Ask Date: 2020/08/15

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it should not be your ex-boyfriend's.
Wishing you good health.

Reply Date: 2020/08/15

More Info


Based on the information you've provided, it seems you are trying to determine the likely conception date of your pregnancy and whether it could be attributed to your previous boyfriend or your current husband. This is a common concern for many expecting mothers, especially when there are overlapping relationships and uncertainties regarding the timing of sexual encounters.

To clarify the situation, let's break down the timeline you provided:
1. Last Menstrual Period (LMP): You mentioned that your last period was around March 10. Typically, ovulation occurs about 14 days after the first day of your last menstrual period in a regular cycle. If we assume a typical 28-day cycle, ovulation would likely have occurred around March 24.

2. Sexual Encounters: You had sexual relations with your ex-boyfriend on February 23, which is well before your ovulation window. Following that, you had sexual relations with your current husband starting on March 14, which is after your last menstrual period and closer to your ovulation date.

3. Pregnancy Tests: You took a pregnancy test on March 8, which was negative, and again on March 30, which was also negative. However, by April 14, you received a positive pregnancy test, and an ultrasound on April 22 indicated that you were approximately five weeks along.

Given this timeline, it is highly likely that the conception occurred during the time you were sexually active with your current husband, particularly around the time of ovulation. The negative pregnancy tests prior to April 14 further support this, as they indicate that you were not pregnant before that date.

In terms of medical understanding, sperm can live inside a woman's reproductive tract for up to five days, but since your last sexual encounter with your ex-boyfriend was on February 23, and you ovulated around March 24, it is unlikely that sperm from that encounter would still be viable for fertilization by the time you ovulated.

Your anxiety regarding the paternity of your child is understandable, but based on the information provided and the medical understanding of conception, it is very likely that your current husband is the father of your child. If you continue to feel anxious or uncertain, it may be helpful to discuss these feelings with a healthcare provider or a counselor who can provide support and reassurance during this time.

In conclusion, while it is natural to have concerns about conception dates and paternity, the evidence suggests that your current husband is the likely father of your child. If you have further questions or need additional support, don't hesitate to reach out to your healthcare provider for guidance. They can help you navigate your feelings and provide reassurance as you prepare for the arrival of your baby.

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Hello, based on the information you mentioned, it could possibly be related to the event on January 21st, but this is all speculative, and sometimes there can be a difference of a few days. Wishing you good health.

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