You say you are 17 and you fucked this girl who is 21 and it was her first time? She fucking lied to you.
a) if shes 21 shes looking for older men not 17 year old boys
b) we know what you look like and theres no way she'd lose it to a dork.
c) if you did use a jimmie hat and also pulled out theres probably a .0000000000001% chance she could even get pregnant.

"In the absence of orders, find something and kill it." -Field Marshall Obs