If you got your period than it is very unlikely. People can bleed during pregnancy but it is never their period. However if you think you might still be pregnant get a test and see what it says since it should be accurate by now.
Probably not if you got your period.
It was probably just late.
Specially with the stress of ttc, it can cause late periods.
But if you think you are, you should be able to get an accurate reading by now if you were to take a home pregnancy test.