Relieve my mind

Okay, I know I'm going to get the "just test; well you need to be more sex educated before you engage; etc" comments, but I'm looking for some real advice and opinions.

My boyfriend and I have not had full on v to p sex, but we will grind naked and we've done anal twice. My period is late by three days, but I've been SUPER stressed about work lately and I had the stomach flu about a week or two ago. I also just pooped for the first time in 12 days. I've googled and it all seems like I'll just have a skipped period, because chances of pregnancy are slim to none, and my boyfriend isn't worried either, but I am and I just feel like I'm pregnant even though I know I technically can't be besides precum possibility. I guess I'm just looking for reassurance or opinions or similar situations