Yes! I started feeling great around 9 weeks and was totally freaking out! An ultrasound at 9 weeks 3 days proved that baby was still doing great! After my ultrasound I felt sick again for a few days, then at 10 weeks 3 days I was feeling great again (and still am). From what I've been told, it can come and go. It's funny how I complain when I'm not feeling good, and freak out when I am feeling good! I'm trying to learn to just relax and enjoy being pregnant (so much easier said than done)! I'm so anxious for my appointment friday, I really hope I get to hear the heartbeat on the doppler!!!