I recently had an ultrasound at 7 weeks 2 days, but it showed I'm actually measuring at 6 weeks 6 days with a fetal heartbeat. For the past four days, I was feeling really nauseous and even threw up as soon as I woke up, but all of a sudden, since yesterday, those symptoms are completely gone and now I feel perfectly fine. Should I be worried about this change? Is it normal to have symptoms come and go at 7 weeks? I had a missed miscarriage around this same time last year, so Im pretty nervous about it happening again.