any thoughts?

Allie • Ttc #2 and step mom of 3 hoping for my rainbow baby after mc in June and March
I posted earlier this morning. I am 3 days late for af. I’m usually never late. I took a test on Monday and Tuesday since I wasn’t feeling well and threw up Monday night, both came out negative. Had af cramps since Wednesday thinking she was coming, thought any morning I’d wake up and she’d make her surprise. Nope, nothing. Today I am less crampy and checked my cervix and it is low and closed. Usually slightly open by now with af coming. I don’t feel any other symptoms besides on and off mild cramps. Any thoughts? Afraid to take another test. Anyone have something similar happen to them with missed af and low closed cervix?