This is solely my opinion only but I look at it like this. A woman that is capable of getting pregnant has a 50/50 chance if a man ejaculates in her during intercourse. If he does not ejaculate this reduces the 50 percent chance into another half making it around a 25% chance. So, assuming that leaves a 25% chance, and assuming even if sperm was somehow released, the thickness of blue jean material would reduce even the 25% chance to almost nothing. It's basically like the lotto, there's only a one in 3 million chance of it happening, and usually if it does they later find out that maybe somehow semen found its way in some other method, such as by "heavy petting." -If you think you might be pregnant, you might think back to wether or not anyone's hands might have touched his penis and then your area. Men do excrete precum and there is some sperm in it. That has happened, though rare too. Hope this has in some way helped.
CUM can get through material as it is microscopic and yes u can get pregnant