Discharge

I'm new to this.. Idk if anyone will see this. But anyways me and my partner had sex 5weeks ago. It was protected sex and we made sure everything was entirely safe.. What I'm worried about is that last month I had my period the day after my birthday which was on the 13th & it only lasted for like 2 days and the flow was really light. This month my period didn't come on the 13th & I've been stressing out and getting anxiety from it thinking I'm pregnant but I know I'm not because we make sure we don't do anything dangerous. Help!!!