Depo shot and pregnant

I was on the Depo when I was pregnant with my daughter last year . I was trying to figure out the date she was conceived on. When I first found out I was pregnant I was 17 week on 24 Dec. And my last depo was 4 dec. I had my daughter on 10 Jun and they kept changing my due date . She was kind of small for a 41 week baby but she's seems like she is trying to play catch up with her weight.I need a dr to answer this because I and no LMP due to me being on the Depo.

babygirl98