Azelaic Acid Gel, 15% while pregnant?

Hey all, I have had gnarly acne my whole life and pregnancy is no different for me. My dermatologist prescribed Azelaic Acid Gel 15% and he knows I'm 19 1/2 weeks pregnant, and said he thinks it is safe as it is category B for pregnancy. I was just curious if anyone has tried Azelaic Acid while pregnant and if it has had any impact on your baby? Thank you!