Measuring large for gestational age?

mamaoffive • 09/2017👣08/2019👣10/2020👣09/2022👼🏻03/2023🌈04/2024👣

I’m currently 29w 3d. About a week ago, I went to my 28 week appointment and my doctor told me my uterus (fundal height) was measuring large for gestational age being as it measuring an entire 3.5 weeks ahead of my due date. She said she’d look into it at my next appointment which will be in a week but I can’t help but feel worried. This is my 4th and I’ve never measured larger like this. I’m also high risk due to history of preeclampsia, miscarriage, and preterm labor. Anyone else experience this mind telling me what the underlying cause is? I know for a fact my due date is spot on because we tracked ovulation and it lines up perfect with my LMP.