AF can show up at any time without being a mc. Stress can bring AF on early. An imbalance in hormones can bring it on too. Lots of things can. Its happened to me several times before where AF has come 2 wks early and i havent been pregnant.

I had a mc at 5 wks and the day i started bleeding the test was negative. I definately mc though cos i had had a positive test days before. And i had been late etc etc. But early on, the day of the bleeding, the test was negative.

So its not impossible that you arent mc but you might not be as well.

I hope this helps somewhat