15 weeks = don't feel pregnant

Anyone else just not feel pregnant? I barely have a bump (I feel like bloat made it bigger in first tri) and my sickness and nipple soreness has gone away. My tummy just feel a little squishy- not hard. It's really worrying me so I'm hoping it's kinda normal. Should I call my nurse? Last appointment was at 12 weeks with a healthy 154 heartbeat. I've had no bleeding or cramping.