My friend & his gf dry humped and they were hading just one layer of cloth (underwear)between them. its been a month now. and her period is now late by 2 days and during the time they humped he had precum maybe. they are afraid now. no symptoms.risk?

Some women who are usually very predictable can skip a cycle occasionally. The amount of delay is unpredictable and there are no real symptoms other than the delay & negative pregnancy tests. If it goes past two months with a negative pregnancy test many OBGYNs would offer meds to bring on a menses. By that point it would usually be quite heavy.

If no ejaculation inside vagina -no pregnancy. Best is to get a preg test if there was ejaculation.