My girlfriend and i were getting intimate. i had mesh shorts on but no underwear. she wore thin underwear and pajamas. i climaxed and it left a wet spot on her shorts. ever since. shes stressed and hasnt had her period. can she be pregnant?

Yes: Chances are slim, but it's possible.She shoaled do a pregnancy test kit. If she is pregnant, the sooner she sees an OBGyn the better.

Pregnancy: In the scenario you described, fertilization is highly unlikely. How many days late is her period? Pregnancy tests 7 days after a missed period are usually accurate. Here is some information regarding how one becomes pregnant: https://www.plannedparenthood.org/learn/pregnancy