PLEASE HELP!!!!!!!!!!!!!!!!?

ok so my boyfriend is stupid and watches "inappropriate" things on this iphone, now im only in 8th grade so like im kinda freaked out! Ok so when he watches those "things" on his iphone he might like get sperm on his like pants or what ever and like i came over that day and i dont know if he changes his pants but we went in the hot tub and he went in his pants and i went in a bikini, so like can the sperm if it was on my clothing like get me pregnant?????????????????????????? and i was sitting on his lap so like if you can please help it would be great thanks!!!!!!!!!!