Is this your first pregnancy? I am just asking because this is my second. I constantly worried during my first pregnancy that my daughter didn't move enough. However, she hasn't stopped moving since being born a year ago!!!!
This time around, I feel like this little girl NEVER stops moving. I feel her constantly almost, which is what I expected the first time around. Every baby and every pregnancy is different. Like Aurora said, if it's the first time you felt it, don't expect to feel it every day for at least a few more weeks. Soon enough, it will become much more frequent, but even then, you will have times that the baby isn't as active as others. As always, if you are too worried, call your doc, they will reassure you in some way that everything is just fine with your little baby!!!!