I had a progesterone level of 10 both pregnancies. The first one I took suppositories. The second I did not. I had different doctors, so they had different recommendations. Both resulted in healthy children. I will say that dealing with the suppositories was no fun and I would not take them unless my doctor thought they were medically necessary.
So weird but my current RE does not test progesterone or do supplements. They don't see it as significant due to new research.
That's really odd to me. All of my pregnancies I lost were due to low progesterone. Once I went on suppositories and PIO I was able to be successful to the second tri when the placenta picked up the slack.
OP I think that's a great number! My RE likes to see over 20 only when medicated but if it stays around 16 then you should be good!