My period right now is almost 2 weeks late. About , a week after my last period, my bf fingered me when we were at the dirve in. The b-room lines were long during intermission so he went and peed in the woods. Well, before that when he was fingering me, I had bee nrubbing around down there on him and he had undid his zipper for me to get my hand in his pants. Well, anyhow, back to after he peed. Since he peed in the woods, he didnt get to wash his hands afterwards. Then he started fingering me during the second movie. A few days after that I gave him a hand job and he grabbed himself when he went off and had put his hand down the back of my pants to grab my lower butt , like, 20 minutes after he grabbed himself. Well, lol, 2 days after that incident, I had some dark discharge, sorta like, brown blood. It must have only last a real short time cause after I saw it in my panties, I put a pad on and it only had like an eensie tiny bit on it then when I went to the bathroom next. Ive been really stressed cause im worried I could have gotten pregnant if he had any precum on his hands when he fingered me or touched close to there. And ive had other stresses. Ive also gone on two vacations and one I was gone for a week and it was over the week I was supposed to get my period, but, like I said , never come. Ive taken at least 4 home pregnancy test and all were negative. So, please help. Its getting to where im so worried I cant function normally and my boyfriend is starting to get ticked off when I ask him about it. So, please help, im desperate

( this has been the first time in at least a couple of months that he has fingered me that much...And ive heard that it could have been left over blood? I dunno)