Can i get pregnant if my boyfriend rubbed his penis against my underwear? there was maybe a little pre-ejaculate on his penis.

Pregnant: Even if there was pretty seminal fluid there has to be penetration for any type of conception to occur

Very unlikely: without sperm at introitus or in vagina.

Absolutely: Anytime sperm have access to the vagina their is a possibility of pregnancy. It is less likely in this scenario as he did not ejaculate, but , your underwire is not an effective barrier to sperm. If you don't want to become pregnant some form of birth control must be used every time .