stress or cause i'm pregnant ?

My boyfriend and I were dry humping 4 days ago and he was wearing boxers and jeans and I was wearing underwear and pants. After I touched his penis over his pants, it was wet. I noticed that I was wet too but it was probably my own discharge.. Is there any possible way that his sperm could have traveled through 4 layers and make me pregnant? If yes, what is the percent chance?

Also I was suppose to get my period today (24th day), but i've been stressing so much about this and I have not yet gotten it..
Do you think it's cause of the stress or cause i'm pregnant ? If it is the cause of stress, when will the period come ? (How many days delay).

Lastly, so many different sites say I can get pregnant, others say there is NO possible way. Please answer all questions. Thank you so much. I'm really worried.