Someone showed me the website for this product called Intelligender. It's a pee test that is supposed to predict the gender of the baby you are carrying. It detects something in your urine that is gender specific. In the case of twins, if you get a 'Girl' result then both babies have to be girls. If you get a 'Boy' result then at least one has to be a boy.
It's only $35 and I am soooo curious to see if its accurate, come ultrasound time. According to their website, you can use it as early as 10 weeks pregnant. You have to be off of Progesterone for it to work, and I am. :)
Sooo tempted! I know two people personally who tried it and it was correct.