little scared

Hi! So I'm just a little bit freaking not too much. So last month I had sex with my boyfriend, it was very much protected with a condom and he pulls out as well. I had a period a day later. My next period was supposed to start two days ago. I know that's not too bad but I have an anxiety disorder so I'm getting pretty anxious. Is it possible? Are there any other signs that could help me? I've read previously that you still can be pregnant even if you had a period right after. #help