I concur with the above posters -- what you are feeling is definitely kicking. I felt my first fluttering around 18 1/2 weeks (first pregnancy), my husband could feel the kicks by about 19 1/2 weeks, and I could start seeing my stomach move when the baby kicked by 21 weeks. Your baby is still small, so it might have moved to a different position in your uterus, which is why you feel the kicks less frequently or they seem less intense. My baby is positioned feet down -- and doesn't seem to me moving around that much -- so I always feels the kicks right above my pelvic bone. If you are concerned about lack of fetal movement, insist that your doctor give you and ultrasound. Otherwise, the lack of consistent kicking at this early stage probably isn't something to stress over.