Possible to get pregnant?

Hey ladies! I just wanted to know if it is possible to get pregnant the last day of your period? Like today all I had was the brown blood when wiping but nothing on my pad. Anyways, my husband and I had unprotected sex. What are my odds of being pregnant? Either way is fine, we are to the point of if it happens, it happens. We aren't actively trying where I am watching my ovulation days and we do it then, but we also not preventing it either. Anyways, it would be our first so just wondering what my chances of becoming pregnant are. I know anytime you have unprotected sex it is possible. Just wanted some outside in put! Thanks in advance!