Possible Conception Timeline: Tracking Ovulation & Potential Father

Question
Me and my bf have been trying for a year to get prego and it wouldnt happen, we had sex alot and im not sure what dates. i have my LMP on the 12th of feb that was the first day and it didnt last 3-4 days, i had sex with another man on the 11th of marcha nd he only put his penis iniside me 2-3 times and nevermore than a few mins. he did not cum in me or no where near me. i took a pregnacy test on the 14th of march bc i missed my period it was neg. i took another thest on the 27th of march in the later afternoon and it was pos i took another the next morning and it was pos. i have had sore boobs and im emotional and i have slight morning nausea. my qwestion is could i have gotten pregnant by my bf or by the mistake i made?

Answer
Even if the 2nd man didn't ejaculate, there is still semen present, and I can't rule out that he isn't the father.

If you get a 1st trimester ultrasound done, that should give you a clearer picture of when you actually got pregnant.  Without that information, it is impossible for me to speculate as to who is the father.

Sincerely,