Ttc after mc-- how do you count months?

Melissa A • Rainbow baby girl born 10/19/15. Pregnant after TTC #3 but threatened miscarriage, so in beta and ultrasound hell.
Dh and I conceived the 3rd month of trying but it ended in mc. We've now been trying again, and it's our 3rd month trying since mc. My question is, how should we count months ttc? From the first month we started before mc? From after mc? Adding the two sets of ttc months together?