In a situation where a man accidentally came on the jeans of a woman, and the underwear of the woman was dry but reeked of sperm smell, is there any chance of pregnancy ? if yes, are emergency contraceptives viable when the woman is on isotretinoin?

Sperm are fragile and die in minutes if they are not inside vaginal mucus. Dried sperm are dead and have no potential to cause pregnancy regardless of the smell.

Pregnancy is not possible in above circumstances, fabric acts as mechanical protection. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety and when intercourse is likely to occur.