My beta at 15 dp5dt was 6694 mIU/ml for my twin pregnancy. I know how sobering that realization that you're having twins is (if your U/S confirms). What you want is a happy, healthy pregnancy like those pictures in the magazines at your OB/GYN's office, and now you're wondering if it's going to be bed rest, pre-eclampsia, NICU, maybe early labor and no babies at the end. But, you know, I carried my guys to 37.5 weeks, I was never on bed rest, the babies went straight to the well baby nursery, and I was 48 at the time. You read more about the problem twin pregnancies on these boards and in the media, b/c as the cops say, there's nothing to see here when pregnancy is healthy, LOL.
And while twins are hard, there are advantages. If 2 kids are your goal, you can say good-bye to your fertility clinic, and I must say, that is one of the nicest feelings in the world. Going for a sibling can be a huge deal financially and emotionally once you have one child. I really hope you have a singleton, b/c I think you'll enjoy your pregnancy and baby experience more with one, but you'll probably be OK if it is twins. GL! Maggie (in VA)