Never felt hiccups and yes, a movement question...

mouse10031978

I am sometimes worried because I really don't feel my baby that often.  It is pretty inconsistent.  Sometimes I feel her a lot, but more often than not I can go for several hours (yes even laying down) without feeling a thing.  I have only been woken up by feeling her kicks once.  I am 31 weeks and I started feeling the first movements around 20 weeks.  My doctor doesn't seemed that concerned and we have heard the heartbeat regularly despite this pattern (or non-pattern- LOL).  I do not have an anterior placenta, but I did start out fairly overweight at around 185. I have never ever felt the hiccups as so many of you have mentioned.  Is anyone else in this same boat?