28 Week Midwife Appointment.

I had my 28 week midwife appointment today, I’ll be 29 weeks tomorrow.
Had bump measured for the first time and was told I’m measuring at 27 weeks. Midwife is contacting my hospital to see if it’s best for me to have a growth scan. This is my first pregnancy and it’s made me come away worrying a little, has anyone else had this in their pregnancies before and all has been ok?