3 yrs ago yesterday at 9dp5dt from a frozen cycle, I got a call that my beta was 51. I hoped for one healthy baby. My betas never took off - I only had one three days later then one at 5w6d when I went in for first ultrasound and saw ohmysweetheavens IT'S TWINS!??! My betas had on average exactly poked along doubling every two days the entire time. Hope this is a little encouraging.