Girls, how are you? I'm worried I might have a missed pregnancy — it's…

Girls, how are you? I'm worried I might have a missed pregnancy — it's bothering me and I'm scared it could be that. To explain: I had an ultrasound on 17.06 and they said everything was OK. The genetics results were also good. But two days ago my throat hurt and I had a fever; the therapist gave me ampicillin and paracetamol. After one day the fever went down and I felt better. Now what I notice is that my baby inside seems to have moved up toward my chest, i.e., toward my upper abdomen. Under my chest it feels like something is there. There is no discharge, and my back and belly don't hurt. I'm afraid to go for another ultrasound — I'm worried it might be harmful. My morning sickness has also stopped. I'm scared now... did anyone have similar sensations at 12 weeks??