Pregnancy: Who's the Father in Your Situation? - Obstetrics and Gynecology

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Determining the biological father of a child during pregnancy can be a complex issue, especially when there are multiple sexual partners involved. In your situation, we can analyze the timeline of events and the nature of the sexual encounters to provide some clarity.

Based on the information provided, your menstrual cycle ranges from 29 to 33 days, which is relatively normal. You had sexual relations with your boyfriend multiple times between May 22 and May 30, and you also had one encounter with a casual partner (referred to as a "砲友") that involved withdrawal (pulling out) on May 30. You mentioned that your ovulation period was around June 1, which is crucial in determining the likelihood of conception.

You took a urine pregnancy test on June 9, which showed one strong line and one faint line, indicating a possible early pregnancy. However, when you had a blood test on June 14, it confirmed that you were not pregnant. This suggests that the urine test on June 9 may have been a false positive or that it was too early to detect a pregnancy accurately.

Your menstrual cycle then arrived on June 15, which indicates that you were not pregnant at that time. Following that, you had another ovulation period from June 29 to July 1, during which you only had sexual relations with your boyfriend, and this time it was unprotected (internal ejaculation). You discovered you were pregnant on July 28, indicating that conception likely occurred during your ovulation window.

Given this timeline, it is highly probable that your boyfriend is the biological father of the child. The key points to consider are:
1. Timing of Ovulation: Ovulation typically occurs about 14 days before the start of your next menstrual period. Since you had sexual relations with your boyfriend during your ovulation period (June 29 - July 1), this aligns with the most fertile window for conception.

2. Previous Sexual Encounter: The encounter with your casual partner on May 30, which involved withdrawal, occurred before your ovulation period. While there is a small chance of pregnancy from pre-ejaculate fluid, the timing suggests that it is unlikely to have resulted in conception.

3. Pregnancy Test Results: The negative blood test on June 14 further supports that you were not pregnant at that time, which means any potential conception would have had to occur after that date.

4. Confirmation of Pregnancy: The discovery of pregnancy on July 28, after having unprotected sex with your boyfriend during your ovulation, strongly indicates that he is the father.

In conclusion, based on the timeline and the nature of your sexual encounters, it is reasonable to conclude that your boyfriend is likely the father of your child. However, if there are still uncertainties or emotional concerns regarding paternity, a paternity test can be conducted after the child is born for definitive confirmation. It is also important to communicate openly with your partner about your concerns and feelings regarding the situation, as this can help in navigating the complexities of relationships during pregnancy.