What was everyone’s first signs??

My period roughly starts in 3-4 days.. hard to say because I can be pretty irregular. I’m 21.. Anyways yesterday I felt like my boobs were noticeably fuller.. that doesn’t help tho could be symptoms of both. But I have had a stuffy nose on and off. Sore throat, hot flashes.. My stomach randomly started hurting so bad at work last night I could barely take it. I wanted to cry.. My co worker gave me an acid reflux pill and it helped a lot. May have been gas pain. Could that be a possible early sign? I had sex last night and a couple hours later ended up with a head ache and woke up with it still today.. It made me super irritable.. I finally just got rid of it with 3 excederin later.. lol! I don’t get pregnant easily I don’t think or I would have been by now 🤣 so I’m not saying I am.. Im not going to test for a while still a week or two at least but I’m just more curious as to what you girls have noticed first right away as signs you were pregnant?