TTC with duphastone

Aika
Hello, 
I had my child 11 months ago. Breastfeeding and formula mixed. Had my first period after delivery when my baby was 5 months old. Since then I'm trying to conceive another baby and not successful yet.
Doctor told me to take duphastone from 16-25th day of my cycle. And reduce breastfeeding. 
If anyone TTC the second baby please share your methods. Thanks