I need help, ladies!!

So my bf and I have been together for just over 5 years and he came in me for the time about a week ago. I was nervous about being pregnant but I just got my period. And I'm pretty sure it's not implantation bleeding bc today is the exact day I was supposed to start. But if I were pregnant would I miss this period or next period? Since it was a little over a week ago he came in me. Also I am on birth control. Have NOT missed any days.