PLEASE HELP BEFORE I GO INSANE

Dymond

So I had an ultrasound 12 days ago on March 15th and they measured me at 5 weeks and 4 days. Well I had a little bit of brown spotting today so they did an ultrasound and said I’m only measuring at 5weeks 5 days😭 then I was told I might just be earlier then they thought. I am so confused and think the baby has stopped growing since I’m measuring the same as 12 days ago!! Has anyone else had something similar and if so what was the outcome? Btw I don’t have any cramps and the brown spotting was just this morning. Hoping for a miracle I had a miscarriage last year and reallyyyyy don’t want to go through that again! Prayers for me and my unborn angel please