Just remember every baby is different, and there are things that could contribute to not feeling movement as soon as your other pregnancies. For instance, an anterior placenta (placenta on the FRONT of your uterus) would pad any of babies movements and you may not feel them as soon. Also, I would think you could rule out an ectopic pregnancy, as you wouldn't be able to carry a pregnancy 18 weeks if it was ectopic.
Also, this baby could just be much more mellow than your others, they are all so different!
Talk to your doctor about it, and they can hopefully reassure you that all is ok...let us know how your appt goes on Tuesday!
Good luck!
