Bleeding during sex

Naomie

Hi all, my boyfriend and I were having sex last night after a few weeks of not having seen him and I started bleeding. I am due for my period, so I assumed that my period started mid-fuck lol but there was no blood on the tampon this morning or at all today. (Btw there’s no way I could have an std my test results came back clear yesterday). Let me know what you guys think is going on