Calculating Conception Date: Pregnancy Timeline and Paternity - Obstetrics and Gynecology

More Info

---

To determine the conception date and understand the pregnancy timeline, we need to analyze the menstrual cycle and the timing of sexual intercourse. Based on the information provided, your last menstrual period (LMP) started on December 24 and ended on December 31. You did not have a menstrual period in January, which is significant for calculating your pregnancy timeline.

Typically, ovulation occurs about 14 days after the first day of your last menstrual period in a regular cycle. Given that your cycles seem to be around 28 days, ovulation would likely have occurred around January 7. However, since you mentioned that your cycles can vary, it’s essential to consider that ovulation can occur earlier or later than the average.

You had sexual intercourse with your boyfriend between February 18 and February 21, which is after your expected ovulation date. The sexual encounters with "B" on February 22 and February 25, where condoms were used, are also important to note. If the condom was used correctly, the likelihood of conception from those encounters would be low.

The ultrasound performed on March 23 indicated that you were approximately 6 to 7 weeks pregnant. This timing suggests that conception likely occurred around January 30 to February 6, which aligns more closely with the timing of your last menstrual period and the ovulation window. Given this timeline, it is plausible that the conception occurred during the period when you were intimate with your boyfriend, rather than with "B."
To summarize, the likely conception date would be around late January to early February, which suggests that the child is more likely to be your boyfriend's, assuming no other sexual encounters occurred around the time of ovulation without protection.

In terms of confirming paternity, the most definitive way to establish the biological father is through DNA testing after the child is born. This can provide clarity and peace of mind regarding paternity.

It’s also important to keep in mind that pregnancy can be a complex emotional and physical journey, especially when there are uncertainties about paternity. If you have concerns about your pregnancy or the implications of your situation, it may be beneficial to speak with a healthcare provider or a counselor who can offer support and guidance tailored to your specific circumstances.

In conclusion, while the timeline suggests that your boyfriend is likely the father, only a DNA test can provide definitive answers. It's crucial to maintain open communication with your partner and consider seeking professional advice to navigate this situation effectively.