You won't be able to feel them strong strong till maybe 24 weeks it's different for everyone but at this point in your pregnancy I wouldn't worry yet. Trust me give it a few weeks. It could be where he is laying at too migr be closer to your back which would make it to where you wouldn't feel the movements as strong
I was just telling another lady yesterday that early in fetal movement (18-23) you will notice movement but very little.. more at morning and night time. Once you hit 24 weeks is when it's possible for you to notice your baby becoming more active in the day. But all babies cam be different! Nothing is wrong but they do like to sleep and rest themselves too!
Thank you ladies! Relieved my worries!