Ladies last night me and my bf we were having sex and my bf is like are you on your period? And I…

Ladies last night me and my bf we were having sex and my bf is like are you on your period? And I was like no why? He's like your bleeding a lot and I touched myself and it was bright red blood like a lot and I freaked out and I went straight to the restroom and I was wiping myself and it was getting lighter and today I have nothing down there !! My last period was March 18, 17 and I don't get my period till next week. It was so strange has does happen to anyone before?? Please let me know it's scaring me lol