When to try for the next one

Star80

My baby is 5 1/2 weeks old and my husband and I want to try for a 2nd one. I’m 38 and the clock is ticking. I hear you have to wait 6 or 9 months before trying. Anyone else in the same boat and how truly long do Inhave to wait? I ask because I had a miscarriage in 2017 and was told to wait 3 months before trying and later found out people tried right away successfully. I was so pissed