What's going on?

Megan
So we found out we were pregnant on 6/7 on 6/12 my betas were 750, 6/15 they were 703, 6/17 they were 667. But by the ultrasounds it's gotten bigger so we're not making any decisions yet to abort since its growing. The top ultrasound is from 6/12 the bottom one is from today. Anyone with a normal pregnancy ever have this happen?