So I have two questions.. I went to the hospital the other day because I thought I was pregnant. Which I am and they…

So I have two questions.. I went to the hospital the other day because I thought I was pregnant. Which I am and they said I was 6 weeks from a pregnancy test. I had blood work done yesterday and they said my HCG level was low of 700. I had an ultra sound done today and got blood work done again and they said it almost doubled it's at 1100 and it hasn't been 48 hours yet and now they think by the ultra sound I'm 4 weeks and four days.. does this sound right ?