Totally normal. I have started to gain only week 20 onwards (gained 1 kg from pre pregnancy weight), and all was good during week 20 anatomy scan.
As long as your baby is showing up healthy in scans, all is good.
I’m also at around week 18 but only gained 1kg since the start. I think as long as baby is growing well not much of an issue. Don’t worry! Just check with doctor if need to gain more weight, usually towards 3rd Tri.
Anonymous