Need help‼️

I don’t think I am pregnant but I have a feeling that I am, I’d be around 3 weeks by now and I’ve been experiencing light nausea followed by headaches (I assumed these were migraines), cramping (similar to period cramps), and tender breasts. The symptoms were too early to be PMS symptoms & my period isn’t for another week so I’m waiting on that to be sure and then I’ll take a test if it doesn’t come. but what do you guys think? Could I be pregnant?