getting your period after miscarriage

I had a miscarriage on june 28 when I went to the doctors on 7/5 they said my hcg levels were negative. and I still havent gotten my period yet. when should I get it?? I've taken 2 pregnancy tests so far and negative but when I was pregnant I got 2 negative pregnancy tests before I got 4 positives...ah it's so annoying because I just wanna fill my empty void. today I would of had my first ultrasound so today is kinda hard for me 😔