Early miscarriage?

My period is extremely regular. I’ve had this app about 8 months and every month the predictor for my period is right.

A few months ago I had a miscarriage. I could feel about 10 days after conception that I was pregnant. My boobs were so sore, cramps, and just intuition I guess. The pregnancy ended at 5 weeks when I miscarried. After that, I got my period 5 weeks later and for the past 3 months, my period is regular to the day as predicted by the app.

I’m supposed to get my period in 3 days. For the past 10 days or so, I have had cramps, sore boobs, basically same symptoms as above when I was pregnant so I have been hopeful. Anyways, today I did a pregnancy test and it was negative. And just now I started my period and it is quite heavy and I have awful cramps. I never get period cramps !

Is it possible I could have been pregnant these past 2 weeks and am miss carrying? Like I said, my period has never been early before. I’ve tried to google this and can’t quite find a clear answer.