Need Advice!!

Maranda
I had sex w/ the guy that I was talking to and the last time we had sex was the last day of my period and he came inside of me. Which we had sex three separate times before that and he came all three inside of me. I'm kinda scared but then again I'm not because somehow those first three times I wasn't pregnant. Is there a possibility I could have been and the test were false negatives? But I wouldn't have started my period in the first place right? Is it possible to get pregnant on the last day of your period? I'm just scared mostly because me and him no longer are talking.