TTC after Miscarriage

First off, I miscarried at 6 weeks naturally the last week of June. I bled for about a week and now am back to normal. I can't figure out how I should set up my glow calendar if we did decide we didn't want to wait. Do I just guess and not worry about the calendar?  Do we need to wa?  When do you think I should expect af?  If. I don't wait, when is a good time to test?