Should i worry?

BabyMomma

At my 26 week appointment, my fundal height was 30 cm. At my 29 week appointment, my fundal height was 30 cm. Today, at my 31 week appointment, my fundal height is 29 cm. Why is it decreasing? My doctor wasn't worried, didn't mention a growth scan or anything. But I am super worried... should I be? What could cause this?