TMI PIC TMI PIC TMI PIC!!!

Hi I posted this picture yesterday thinking that possibly AF would show up but after that one wipe there was no more blood?!. Here's a lil background of my situation. My boyfriend put it in for a couple of seconds with little to no precum. This was roughly around I wanna say 8-9 weeks ago. So I freaked out about that, but then I was bleeding for a week like 4 weeks after the incident. So it should have be my period. My period before that was in September so yes I am a bit irregular. But I decided that I should have taken a pregnancy test just to take on to make sure. I took it two weeks ago and it came out negative!! So I was happy about that but then a month later after my period this shows up? What would it be? I'm also experiencing sharp abdominal pain like really really sharp :( I just want to know if it's normal please help.