At this point you still have over half the pregnancy to go! You have not even hit the time when you grow the most. I wouldn't stress about how pregnant you feel or don't feel. As time goes by you will get bigger and bigger and feel more and more pregnant.
I am almost 16 weeks with my 3rd and feel the same way. I told my dh last night that unless I get little kicks I forget I'm even pregnant. I feel guilty for not relishing every moment like I did with my daughter. I mostly feel constant guilt for picking up my daughter, not eating right, drinking enough, taking time to rest and general care issues. I don't have that connection to the baby yet. This time around it's more worry and discomfort rather than joy and excitment. I know that will change once the baby is born if not sooner. Try to relax and enjoy these last few months with just one child before the circus starts!
I'm 38 weeks pregnant with my first and felt the same up till about 20 weeks.I wasn't very big yet, didn't feel much and quite often just forgot that I was pregnant at all. I think that changes over time, at one point you can't get around it any more! Don't think you should worry too much, it'll come :)
I'm just over 16 weeks and am just the same!! I keep trying to feel for kicks and flutters but nothing!! had a few scans so know it's there and heard the heart beat yesterday. I think its because I had a miscarriage in December so ive kind of disconnected and dare not get too excited. But I forget I'm pregnant with my first I was obsessed!! I just can't wait till November!! good luck