Birth Control pill

So i recently stopped taking birth control but i finish a whole pack. After about three-four days after i stopped taking it i didn’t necessarily have sex but i fear i got a little precum on my vigina! my boyfriend tried to go in but it didn’t quite work out. no condom was used so is it possible i could be pregnant. I NEED help! is there a chance i could be pregnant? i have been very nauseous and threw up a couple times, but i don’t have tender breast, cravings, or anything like that.