So I recently found out I was pregnant I went in for a ultra sound and there was no gestational sac in my uterus the doctors said they found some fluid I got my hcg back and it says it’s at 640 right now how far long would that make me ? Does anyone know why it wouldn’t be showing in my uterus ?i will put a picture of my ultra sound I circled around where the sac should be but it’s closed dated from my last period they said I should be 5 weeks and it might be too early but with my son he showed in my uterus at 3 weeks