Can you get pregnant if he precums on your pants while dry humping? no ejaculate? got period a couple of days later.read it's possible/freaking out?

Probably not...: I would think this scenario would be unlikely to result in pregnancy, but if you want to be sure, i would recommend purchasing and using a home pregnancy test. Good luck!

Possible, unlikely: Of course it is "possible, " there are sperm in pre-ejaculate. That said, it is extremely unlikely for a swimmer to penetrate through layer(s) of clothing, to vagina, to uterus, to fallopian tube and find your released egg within fertile window (~4-6 days/mo) mid-cycle, so just before period even less likely. If worried, check home pregnancy test for reassurance.