I resently went to go visit my boyfriend out of state. We had not seen each other in 8 months. I had may last period two to three weeks before I saw him. I am not sure of the exact date because of birth contol pill mix ups 4-6 months ago. I quit taking the pill so I am not sure of my regular period date. I had sex with him the first, third, forth and fifth night I was there (8/31) (9/2) (9/3) and (9/4). I believe I was suppose to start my period the following week and didn't. I took a home pregnancy test yesterday (9/22) and it was positive almost instantly. He questions my faithfulness and says the time doesn't add up. Please asure he is over analysing things.

Yes, if you had unprotected sex, during that time frame you could be pregnant from that. So after child is born you will need a DNA test to verify who the father is.

You can conceive at any time during the month sometimes even when you're on your period

If you happened to ovulate around the time you were with him, it adds up just right.