My girlfriend and i had dry sex.she was in her underwear and i was naked.tip of my penis(a little wet)touched her wet vagina (not directly)through her underwear.and her menstruation date is a bit late but she is always irregular.we are worried if she is p

Do a test : The risk of pregnancy is low if she had her panties on properly but if her period is late, check a pregnancy test and repeat it in 3-5 days if it is negative. Now is the time for her to look into starting a reliable method of contraception so you don't have this worry again. Best wishes.

Barrier-not enough: I suggest condoms PLUS spermicidal foam, jelly. vaginal sponge or vaginal inserts. Your sexual encounter was far from "dry sex"- get real and be responsible for you own sexual activity. Have her checked for pregnancy.