I’m 16 and afraid help pls

Period is supposed to come today. And I have stomach pain and my boobs are kinda sore but not really...... I’m very confused because I haven’t had sex since the summer and I’ve only given handjobs and blowjobs were the guy came but there was never no penetration or any way it could’ve gone in my vagina!!!!

Should I be freaked out or not!!!!!!!!!!!!!! Also I don’t know if it makes sense but usually I get my period every 27 days and this month it put it for the 26th day.... maybe I will get it tom????