My anxiety is through the roof

Okay so I just had sex with my boyfriend and I’m supposed to be getting my period tmrw. When I came home from work today I noticed I had some brownish reddish discharge in my underwear which usually happens right before I get my period. So tonight we had sex which didn’t last very long at all maybe at most 5 min. I said I wanted to stop so we did. He wore a condom the whole time and didn’t finish. We even filled the condom with water and squeezed it to make sure there were absolutely no holes. Yet, my anxiety is still getting the better of me. Someone please reassure me that my period will be coming tmrw and I can’t get pregnant from this.