Congratulations, i would say you are definately pregnant anything over 50 is a definite positive, how many days were the embryo's at transfer? as an example i had 2 2day embryo's transferred and tested 13 days later so 15 days post transfer and my beta was 569.
good luck and enjoy!!
Me 39, DH 40. TTC 5years
4th times a charm,1-IVF, 3xFET's, 2 chemical
Twin boys born 9/7/08