I bled after sex

Kate
Should I see a physician? It was the day after my period ended and I had sex with someone and after we were finished bled a bit. It was bright red so I know it wasn't from my period. This is the first time this happened so I am a bit worried. Also I felt very uncomfortable the whole time we were doing it and ended up stoping and finishing a different way. 
Ps he is also the biggest I have had.