Question?

I’ve had a miscarriage wayback like 8 years ago found out at 3 weeks (home preg test) from morning sickness and at 6 weeks miscarried.

I was suppose to start my period today and I haven’t. (No signs of period or pregnancy just slight wired feeling cramps here and there minor)

I work at OBGYN office and we ran a preg test (did not do the blood) and it was neg.

I’m VERY reg!!!! This app is 100% right and I always start when it says.

What could this be?!?!?!? Why haven’t I started yet? Why does the preg test say neg.! Has this happened to anyone before???????