PLEASE ANSWER!! FREAKING OUT! pregnant or period?

So I just checked my underwear and there was some blood in it and I still shouldn't have my period for 10 more days. I was with my boyfriend Saturday and I have him two blowjobs. He didn't finger me, just quickly put his hands in my pants but that was before he even touched his dick. The only way sperm could have touched my vagina was through my underwear when he rubbed me or when I went to the bathroom but I washed my hands before (I think, I have bad memory). I've been cramping and very tired lately.  Could this blood be my period or showing I'm pregnant? Also, I can't get a test