Pregnancy After Miscarriage

I found out I was pregnant Last year and at my second follow up Ultrasound, I found out that I had lost my sweet Baby. On December 17, 2018, I had my first D&C. I had to have one because I experienced a “missed miscarriage” which means my baby would not come out on its own. After the first D&C, my levels would not go down. In fact they kept going up, causing me to have a second D&C performed in January of this year. After the Second D&C my HCG levels still would not go back down and at that point I had several what the doctors called “cysts” in my uterus. Causing me to go back in for a third D&C on March 15. I finally got my levels back down. Meaning I am no longer pregnant. Essentially, what I am wanting to know is - how long did everyone in my similar situation wait to start TTC again?