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Hello from justAnswer.
What is your due date?
Is the due date based on your last period or an ultrasound (or both)?
I had asked for your due date and have not heard back. After I did not hear back, I noticed that you posted another question and said that an ultrasound on may 8th showed that you were 7 weeks and 4 days pregnant.
The standard dating of pregnancy is relative to the day of the late period. But, to be this far along on an ultrasound done on May 8th, that would mean that you would have ovulated and gotten pregnant at the end of May, around May 29th or May 30th. The actual day of intercourse could have preceded this day by several days, since the sperm can survive in the female genital tract for several days. However, it would be impossible for sperm from a sexual encounter on Feb 12th or 13th to have survived in the female genital tract to have caused this pregnancy. The sperm simply could not have survived from mid-February to the end of March. So, if the only time that you had sex with guy number one was on Feb 12th and 13th, he could not be the father. If the only person with whom you had sex in late March was guy number 2, then guy number 2 must be the father.
If i can provide any additional information, please let me know.