Not feeling movement

I'm 26w3d today and I spoke with my doctor three weeks ago telling him I don't feel him kick a lot. That I can go a day or two without feeling anything. He just kinda brushed it off and said maybe I have a lazy baby but as long as I feel him every now and then I'm fine. Well next week I'll be in my third trimester and still go a day or two with not feeling him at all. I plan on bring it up again Monday when I see him and hoping he's not going to just brush it off again. I was wondering if any of you ladies have experienced this? And my anatomy ultrasound at 20weeks was normal. Placenta and everything was in the correct spot.