well after 8th day of my period me and my bf get turned on n we were standing against the wall and he rubbed his pe***s to my vagina for 2,3 times and then the ejaculated his sperm on my belly.i was also wet n i think his penis also had pre-cum.i m still a virgin it is possible that i can be pregnant? because after 2 3 hours of this i felt pain in my lower belly and i found brownish thing in my underwear