10 days past a 5 day transfer, or 15 days past egg retrieval, my levels were 609. It was too early for an ultrasound then, of course, but within minutes of the results coming in, our doctor said the levels alone were enough to make him certain 'there was more than one in there'. Actually, there were three, but we lost one at six weeks, and went on to have healthy twin girls. I didn't have any other HCGs taken, so that's the only one I can give you, but the day and numbers are absolutely exact. I do know though that once levels really start skyrocking as yours now have, the range varies so much it is difficult to read whether twins are likely or not. I think it is those first HCGs taken from day 14 and within a few days after that that are the most meaningful indicators.
