News Yest please please help me

I am thinking the worst please help me I can't stop Crying all the time I cried myself to sleep last nite.. I had my I thought 10 w scan yesterday and ob said Bub is quite small for 10 w and said the sac is bigger than it should be couldn't see a HB. I haven't had any spotting no cramps still nauseous he got me yesterday to have bloods which I did and need to go Thursday first thing which he said i will know by Thursday Friday what's going on he wants my HCG levels to double. Then he will know he also said I may have my dates incorrect has this happens to anyone and got a + Results? I have done a test on Monday and the lines were dark pink on both sides