What to I consider start day?

Question

I started bleeding on July 25. It was really light. My boyfriend came home from the Marines that night, we had sex and I stopped bleeding. It started up again on the 27th this time it was normal. So when Im counting days to see when my next period starts what day do I consider start day. Im trying to figure out if Im pregnant or my period is late. Hopefully this makes sense to you.

Answer 1

go with the 27th