Measuring less than I should? X

Hello! I'm supposed to be 20+4 weeks, I had my 13 week scan a 7 week scan and a 5.5 day week scan and each have been accurate.

Until this one.

I'm measuring at 20+4 we'll should be but they say I'm measuring at 19w2d but no problems what they can see in physical, they're rescanning me in two weeks and they said if baby hasn't grown they're referring me to another hospital, I'm worried now, is this normal? Is my baby in danger? X

My little Issac 💙