Bad period symptoms or surprise pregnancy???

I desperately need some insight here. Let me start off by saying I am on the Mirena for birth control, which is an IUD and 99.9% effective. I usually get period symptoms two weeks ahead of time, which had been right on schedule this month. I’m due for my period this week but I have yet to get it. Although, this time around my boobs have been SO. SWOLLEN. And INSANELY tender. I’ve been experiencing pretty much my normal symptoms like bloating, headaches, fatigue, tender breasts are a usual thing too, gassy (tmi I know😬) but for some reason I am absolutely freaking out that I might be pregnant. Plus last night I got such a bad migraine that I threw up, and my breasts don’t usually get this bad. Not only that but I’ve been having unprotected sex the last month and he also didn’t pull out once.. and we definitely had sex while I was ovulating. I found out that two of my friends have gotten pregnant within the last month and I have a feeling that’s why I am so paranoid. Is there a chance that I’m just being waaay overly paranoid and making this worse for myself or could I be pregnant? I know the chances are slim for me to get prego, but you just never know. I need some reassurance here😩