5w3d low beta, help!

I am just learning how to use this app and can't find my previous post. I had a miscarriage in October at 7w4d and am so nervous! My dr. did baseline labs on Friday and said my beta is only 66. I go in for repeat blood work tomorrow. I barely got a positive test on Tuesday evening, a very faint line, and Wednesday it was a little darker. So that mad me happy but the nurses comments about the low beta made me so nervous. I know there's nothing I can do but wait for the results tomorrow. Maybe I'm not as far along because of late ovulation? Anyone else had low beta and it was ok?

The top is Tuesday night and bottom is Wednesday am. Thursday I did a digital and got a positive too. Thoughts? ?