? AF on its way already

Kristine
Hi guys,
This is my first time going through all this so I'm totally confused. Miscarried last Thursday when hcg dropped off a cliff in two days... And the bleeding had come to halt.  I was only about 4w4 days along. 💔
Now Sunday, I'm having some cramping that is pretty reminiscent of impending AF..is that possible already?
Sorry I'm just totally ignorant to everything on TTC after a MC.
Thanks for any input!