So Nervous!

I made 12 weeks Sunday. I've had an ultrasound at 7 weeks saw baby and heartbeat. Over the last 5 days, I do not feel pregnant anymore at all. Every since the moment I found out I "felt" pregnant, morning sickness, sore boobs, full filling everything! No bleeding no severe pain I just feel like something is really wrong. Any of you guys feeling the same way or experienced this before?