It's pretty normal to feel the baby move more some days than others. This baby would go hours without moving (she moves more now). All babies are different too...some are more active in utero, others are mellow. I tend to think it reflects their personalities! Most doctors don't have you count kicks anymore, but the ones that do don't ask until you're in the final trimester. You can google how to do it. Placenta positioning can make it hard to feel some movement too (like if it's in front).
Generally, if you don't feel baby move at all for a few hours, drink something/eat something (if you can) and lay on your side for a while. You should feel some movement within an hour (doesn't have to feel like a huge movmement, as long as you feel something).
I'm sure everything is normal in there! Ask your OB next visit if you're at all concerned though!
DD1 born Jan 29, 2010. Mod-Severe HG. Started treatment at 5 weeks. c-section (breech)
DD2 born July 23, 2012. Severe HG started treatment at 4 weeks until birth. VBAC!