Needing some encouragement

Me

So I’m right around 4w 3 days and at 4w exactly my hcg was 906. Today it is 1900. They did an ultrasound and said its so early they probably wouldn’t see anything. They said they saw what could be the sac but they aren’t 100% sure but with my levels so high and not being able to see anything yet they THINK it should be okay but aren’t completely sure. Has anyone else experienced this and gone on to have healthy pregnancy? I am so worried 😭