Ive had constant nausea with my last 2 pregnancies, which have eased off around 14/15 weeks. Are you taking folic acid still? Nausea is a symptom, so I stopped at 13 weeks, and it eased. Pretty sure it caused constipation too. I have been plagued with headaches the last 3 weeks (I’m 17 weeks) even though I have a high water intake. May be the weather?
Maybe take photos of your bump and compare. I don’t think you would grow much in a week (might be different with twins)
I know what you mean about 2nd trimester loss. It seems to be everywhere on Instagram and as much as I try to avoid, I always look and panic. I’ve never had this in my previous 3 pregnancies
If you are really worried, give your midwife a call and explain what has happened? Or maybe book in for a private scan?