My boyfriend and i were messing around last tuesday and i got his sperm on my hand. around 30 minutes when i got home, i used the restroom and touched inside my vagina with the same fingers that i had sperm on. it's been about 8 days and i'm starting to feel pregnancy symptoms, but i think it might be all in my head. but this morning, i had dark brown discharge and i've read that it can be implantation bleeding, so i'm pretty nervous. could i be pregnant?