Birdiee

Hi,
It's been 41 days (approximately) since my last period. I've been somewhat irregular in the past and being a University student around mid-terms I've been pretty stressed out and had terrible sleeping patterns lately. I've never actually had complete intercourse with a guy (as in a guy has never actually entered me) but I'm worried that at some point there's a possibility that his pre-*** may have gotten rubbed somewhere near my vagina and I somehow got pregnant from that. What are the chances of that happening?

I might be getting too stressed out about it, and ironically causing my period to be even later, but I'm just worried.

Any answers would be greatly appreciated!