Hello! I Am 18 Year Old Virgin And I've Been

hello! I am 18 year old virgin and I've been freaking out lately. around 2 weeks ago I was messing with my boyfriend, we rubbed genitals naked. Penetration or ejaculation ( before or after (and he hadn't ejaculated recently and had peed many times before rubning) did not happen. I think there was a little of precum. and I was ovulating at that time. is there a possibility that I am pregnant? my period is a bit late but it is sometimes irregular. and I feel nausea. could this all be in my head and could my period be delayed from stress? because I've been really freaking out about this situation for the past week or so. thank you for your answer!!