20 week scan. Made me anxious.

Just wondered if anyone had experienced anything similar. Went for our 20 week scan yesterday at 19+6 (UK). I'm a little overweight so understandably harder to get a clear scan. Baby was showing up clear and student sonographer took head measurements, all on track. Got clear photos of the legs too. But couldnt get other clear measurements, she could see eye sockets and nostrils but seemed not to be able to see lips clearly. She has booked us for a rescan on the 13th when baby is 'bigger' to get accurate measurements. She also said baby is short (I'm 5ft and partner is about 5ft6/7) so totally understandably why. It's just left me feeling anxious and nervous. Has anyone else gone through this? How did you cope with the wait? I'm usually so laid back. My first pregnancy was a breeze!!!