FTM and worrying 😬

This may be a silly question, but being a FTM I’m completely clueless. I’m 28 weeks and 3 days and I’ve noticed I’m not feeling my son as much as I use to. I still feel him moving around and kicking, but not as hard or frequent as the prior weeks. I know kick counts are suppose to start at 28 weeks and I’ve been driving myself mad because I’m not feeling them 😅 should I be worried? Is it normal to have days where I don’t feel movements as much? I should mention I do have an anterior placenta. I do plan to call my OB and ask them tomorrow.