Betas not doubling

Kar

So I transferred one embryo and at 5dp5dt (fet) I got a faint positive they kept getting darker but now I’m concerned about my beta numbers.

BETA #1: 119

BETA #2: 182

BETA #3: 299

They are bringing me in for an ultrasound Wednesday to see what’s going on. Feeling very nervous and upset. I had a miscarriage in May and my numbers always more than doubled. Anyone had this and went to have a viable pregnancy?