TTC AND IN MY TWW

I lost a baby while I was 22 weeks pregnant back in 2017. We started trying in March of 2018 and still getting negative test. If AF comes in 6 days then I’ll be starting on letrozole to try to conceive our 3 baby. One night during our ovulation week after we bd I put my legs in the air against a wall for about 30-45 minutes!! We have a 2 year old son. We just want another baby and a little sibling for our son to play with.