I think they may be twins, too. Don't scare yourself. Go to BC. I am HCG5460, and my actual gestational age is 38 days. Compare with yourself. Some people are taller, others are lower, and it is also possible that your cycle is short, so the actual pregnancy date is a little longer than the conventional algorithm. Because the base of HCG is getting bigger and bigger, it is normal to double the number.