TTC after miscarriage

This is my first cycle post D&C and my husband and I are actively TTC. It took 6 weeks to the day for my first period after the procedure for AF to come. Now I am 6 days late and still nothing. I took a test 3 days before AF was due, the day it was due and today. All BFN!!! Does anyone have any insight? Will it take a while for my cycle to regulate?