Hi mummies, anyone has night sickness instead of morning sickness?

I just reach week 7, I started once or twice nausea from week 6. It only happens after dinner (8pm+ onwards). Morning & afternoon sometimes I forget I'm pregnant, zero feel. I feel worried at times because my belly shows no growth (yet), and I feel totally like I'm not pregnant. Seen gynae 2 days ago, can see embriyo's heartbeat. So, am feeling better now. Initially I was praying for some signs (nausea), but when I really feel nausea, I felt like "dying", very miserable.