Pregnant or Not?

So I have been on this app for almost a year and it has my cycles down pretty perfect. It says I was supposed to start today and nothing so far, I normally have pms, backache, sore breast and cramping days before and none of those have happened yet. Today my nipples got a little sore... TMI so I have the thought in my head could I be pregnant or just over thinking it! 😬😳😩 I want to take a test but think I should wait a day or two just in case my period decides to make a late appearance. But any comments or advice to help pass the time would be greatly appreciated. 🤞that I'm pregnant 🤰