Try not to stress LMS (even though I know that's much easier said than done.)
So long as you're not underweight and eating healthily I'm sure it's nothing to worry about. If it will give you reassurance another scan is very reasonable.
Lots of babies seem to grow in spurts so you're little one will likely catch up. After worry about not gaining enough weight I put on more than 4kg in less than two weeks recently and then stayed stable for the next two weeks!
The weight loss is only something to be worried about if you don't have any weight to loose. If you're average, to overweight, and you are still healthy it's really nothing to worry about. I'm sure your doctor/midwife would say something to you if they were concerned, but if it is bothering you ask at your next appointment.
As for bubs measuring 7 days behind. What is really important to remember is that they are measuring from guesses of where the baby end (ITMS?). As in they can't get inside you to actually see how big bubs is so they are measuring off an ultrasound, which is basically a fuzzy picture. So they are guestimating where to put the points to measure from. Granted they are educated in how they do it, and they do it a lot, so their accuracy is pretty good, but at the end of the day it is still just an estimate, which is why they give up to a 2 week leeway. If you'd had another sonographer measure 10 minutes after your first scan, you'd probably get a different measurement yet again.
Both of mine were measuring roughly on dates the for the whole pregnancy but at 20 weeks DS's kidneys were slightly smaller than normal. They did a precautionary U/S at 32 weeks to make sure all was ok & they said it can be quite normal to have bubbas or "bits & pieces" measuring a bit behind as they usually have a growth spurt in the following few weeks which catch everything up!
If they were concerned they would have contacted you by now. Try not to stress too much chick. Bring up your concerns at your next appt but I'm sure it'll all be fine!
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