Movement

Hi! So I'm a FTM, 28 weeks with a posterior placenta. I am struggling with fetal movements because I really don't feel a lot still. If I'm sitting at my desk at work, I feel the flutters/tickling feeling very low like at the base of my belly. If I'm laying down and putting pressure on my belly by laying on my side, I can feel movement. I very rarely feel actual kicks, though. I know every time I've had a scan ( I get them monthly) he has his feet above his head so I don't know if his position just doesn't change and that causes me to not feel him much or what. I have already made a trip to the ER once and they said that he is fine and that I should be feeling kicks. Is this normal or has anyone else gone through this??