W..
Congrats!
You won't feel constant movement.... you may never, or until the last few weeks you deliver. sometimes the baby is sleeping and right now the baby is not very big, compared to your body.
Also, the more YOU move the more your baby is either moving with your or your movement has "rocked" the baby into a calm state of relaxation or sleep.
You can stimulate the baby to move by drinking a glass of orange juice and then laying VERY STILL on your left side for like 15-20 minutes.
But you don't want to do this alot - or you will be drinking too much orange juice and laying around all the time....lol.
You can also go into the dr and have him/her listen for a heart beat.
Don't worry too much - that will just snowball and stress is not good for you or the baby. But, yes, it is nervewracking!!!!!