I don't believe pregnancy tests are as good as they say. I was a week late for my period before I could get even a faint BFP and now i'm 15 weeks
The doc told me you are more fertile after a mc, so there is always a chance you could be pregnant again. Normally your period should come 4-6 weeks after your mc, if you are worried and want to know an answer I would recommend speaking to your doctor, they can give you blood tests to see if you have any pregnancy hormone, and if you are not pregnant they can help with getting your period started,
I hope this has helped hun
c
xx