Last year had a cow calve on May 3. Three weeks later she appeared to be in heat. The vet came several days later to implant embryos and we had him check this cow to verify what I thought. He said yes she had been n heat. We were going to use her for a recip but he thought better wait till next cycle, which is what I thought. He was coming back a couple weeks later to implant again so we waited 11 or 12 days, injected Estrumate, she cycled, he implanted an egg, and she calved this year on March 20 with that ET calf. Moved her up about 6 weeks and with an embryo no less. Sometimes it's better to be lucky than good!