Soooo I'm 18 weeks today and I'm not really showing (this is baby number 2) and also I don't feel…

Soooo I'm 18 weeks today and I'm not really showing (this is baby number 2) and also I don't feel "movements" just the occasional butterfly. My dr said I should be feeling her soon. And I went to the Monday and everything was fine, we could even hear her kicking the heart monitor. I just don't feel this is normal.