Pregnant after miscarriage?

Hey guys!

I normally have slightly irregular periods that vary from a few days late (2-4) to 7-9 days late.

I miscarried July 31st of 2016 at 7w6d and AF came exactly 4w later Aug 31st 2016.

I miscarried recently Aug 2nd 2017 at 5w4d bleeding stopped on the 10th and we resumed.

Both happened naturally, no D&C;, no help, just as natural as a period, both ultrasound confirmed I was completely empty at 8 (2016) and 6 (2017) weeks.

AF still isn't here but I also had 2 bfn, most recent negative was on the 5th :(

When should I expect AF or test again?