When will my pd come?

Tori • Baby Kinlee due 12/17.
So I miscarried 4 weeks ago at 5 weeks it all went natural it only took 3 days for my levels to get back to zero. I have no sign of AF. I've only had sex 2 times since it happened. When will I get my period again? How long should I go without one before I should take a preg test?