Progesterone supplementing into second trimester

Is anyone continuing to supplement progesterone into the second trimester or beyond? I tried weaning off at 12 weeks but experienced some spotting. After 3 miscarriages and a late preterm birth we decided to continue to supplement a bit longer.

I’m now 18 weeks and going in for my anatomy scan this week. I expect the perinatologist to suggest weaning off but I’m nervous.

Anyone have experience with longer term use of supplements or use to avoid preterm birth? Thanks!!