i'm at the end of my 18th week and i seem to be feeling some slight movement in my belly these days, but still cannot be sure if it's fetal movement or gas (since i'm also very bloated). But most should be able to feel fetal movement by 20 weeks. If your placenta happens to be anterior then it may take longer for you to feel it.
I felt quickening at week 15. Mild movement that can make you feel ticklish. 😅 at 17.5 weeks I felt kicks already when I’m lying down. Most frequent in the evening tho.