Bindy,
Usually coming into the second trimester symtoms (especially m/s) do start to vanish. If you are concerned in any way contact your ob or dr and arrange an ultrasound to put your mind at ease. Unfortunatly for me I was 11 weeks when I noticed my symptoms started to vanish but I was also spotting and had other symptoms when I miscarried. So from what you are describing it sounds like everything is normal!
Enjoy your pregnancy!