the now have over the counter dna test that you swab the cheak and send it in, however you would have to swab the cheak of your boyfriend to compare it to!
You wont know for sure until a DNA Test but the first day of my last period was January 11th but I got pregnant after measurement of the baby at the ultrasound and it shows I actually got pregnant New Years Eve/Day. I am due Oct 9th. So not sure how much help that is.
it could be either or u wont know 100% for sure with our a dna test