How long did you wait after having your first child to start trying for your second?

Our little one is about 7.5 months old. We know we only want two kids and struggled with fertility to become pregnant. 3 years TTC, lots of fertility meds and appts, 2 successful IUI’s, 1 missed miscarriage before welcoming our daughter 12/30/18. I just turned 34 and want to have our family complete sooner rather than later. We would like to have our kids closer together. How long did you wait between welcoming your first and trying to convince your second??