Transplant then postpartum hair loss - can it take a long time for transplant to grow? (Photos)

So I am on my 4th hair transplant procedure (I can’t believe it either) just for the hair line. I had my last transplant done in February and then a lot of my hair fell out in April due to postpartum. I had baby in December 2021. So fair I see no growth and it has been 9 months. Maybe a tiny bit but still looks sparse. Can it take a long time for transplant to grow in if you had postpartum hair loss after?