I went through a stage where for a week or so around 18ish weeks occastionally I got preiod like cramping. I had a scan (not for that reason though) and everything was fine in there.

Not sure about the DR being able to feel movement though oO;; I have never had mine say that to me, but it can be possible I guess? They say usually mummy can start feeling bubs move around 16 weeks.

If he's told you to take it easy I would, and if they get to bad, or come with any bleeding head straight back to your Dr. Otherwise, to put you out of your misery demand to have a scan now to ease your mind