Af after m/c?

I had an early miscarriage on 1/1/16, my hcg was a 0 on 1/4/16.  My doctor said we can try right away so we have been but he also said to expect af in 4-6 weeks.  I am currently 12dpo but have no idea when af is coming.  Yesterday was 4 weeks but I guess it's not considered late.  Negative hpt with fmu today.  Am I still out for this month?