Due Date Concerns!

Ruby • 29. Mommy to Celeste and Juliette 👶🏻♥️ Army wife 💍 Pregnant with Baby #3
So initially I was told my due date was August 20th when I thought it was Aug 13th based of LMP, they then changed it to August 18th but he said he wasn't quite sure if he was measuring accurately due to baby hiding and at the Anatomy Scan 4 weeks later I was told she measured bigger but they "couldn't change my due date". That concerns me because I don't want to risk going way over my due date if not necessary due to having already lost 4 babies. Is this odd or completely normal? My husbands aunt also lost her baby 2-3 days before being induced after her last appointment, the cord teared. She was fine at the appt and was then told when going into L&D her baby passed 😔