If sperm is on the vagina hole can i get pregnant?

okay, me and my boyfriend had sex on the couch and well he pull out and he started to *** away from my vagina, well i thought that his penis came out while we were having sex, so i put it back in me again. but then i notice he was trying to pull away so i quicky back away. so i really dont know. but some of it did dripped on the ground and i did try to wipe myself with toliet paper so yea could i get pregnant if its on the hole?