After miscarriage when are we most fertile?

Aine • Baby Noah arrived 10th March 2017 🌈
I had a missed miscarriage. I miscarried naturally on Saturday. We want to try for our rainbow baby, and I have heard people on here say that you can become pregnant again before your next period. On glow I cannot track until after my Af returns though. Any advice or has anyone become pregnant before Af returned?