I need some serious advise

Miscarried almost 6 weeks ago.

I was 13 weeks pregnant.

I still haven’t got my period back.

Within the past week or so I have felt pregnant.

-Extreme fatigue.

-Nausea.

-heartburn.

-Headaches.

-Frequent urination.

-Curved appetite.

-Slight cramping on one side.

I have taken 2 tests and they both came back negative.

Me and my husband have been actively Ttc for almost 4 weeks..

Could I be pregnant?! And when should I contact my doctor?

Any and all advice is much appreciated!