If you are expecting twins and don't know what to expect, you are not alone. Many women pregnant with twins have no idea what to expect, but that doesn't mean they -- and you -- can't learn. So here is some information to help you understand what's happening when you're expecting twins.

A twin pregnancy is a double blessing, but it can also carry greater risks than singleton pregnancies.

In the U.S, about three in every 100 pregnant women give birth to twins or triplets, according to the Mayo Clinic in Rochester, Minn. And by many accounts, twin pregnancies are on the rise.

Be prepared. Familiarize yourself with the top 11 things you didn't know about your twin pregnancy from conception through delivery.