Why dont I feel pregnant? 18 weeks

To

I am 18 weeks on Tuesday. This is my 5th child. I have not had round ligament pain, no sciatica, no movements, no flutters, no heartburn, no morning sickness... absolutely no indication i am pregnant aside from no periods. I had my last appointment at 15 weeks and there was a heartbeat and scans say baby is healthy. Theres a lady who lives up the road having a baby due April too and shes huge. I am barely showing. With my last babies I had a belly and all those awful symptoms of pregnancy as well as movement by now. What gives?

This is my stomach from last night but i was so much bigger with the others... i feel like im not even pregnant.... is this bad? i feel too "good"