Needing some prayers right now....

Just went in for my third ultrasound and things didn't look good for my babies.....first ultrasound was at 5wks and showed nothing but two empty sacs which is to be expected....2nd us once again only showed two sacs, they grew but not as much as doc would have expected for as many days in between and measured me at 6wks 4days....this last ultrasound still only showed two empty sacs. Now I'm waiting to talk to the doc and thinking that I'm not gonna get any good news. I should be 8ish weeks at this scan and would think that they would be able to see something.....😥 it was supposed to be twins!