Confused

So glow told me AF was coming sept 28, I took 3 tests two days before and got bfn's. Because I didn't get AF on the 28th, I removed the notification from the calendar and now glow is showing me AF on Oct 5th!? That would be well past a 30 day cycle which is my norm. I've been having mild cramping, my nipples are crazy sore and last week I had a headache for 4 days straight. I'm hesitant to test again or wait it out. Anyone else have glow mess up their cycle? I'm so confused now. If I am pregnant, would the cramping be normal? I feel like my period is coming and that's why I'm hesitating to test. Sigh.