I know how you feel. I am staying position for my baby and I am fortunate that I have at least one. I have been doing IVF for 1.5 years and FINALLY got pregnant this August. It was icing on the cake to have twins, but truly the intent was to just get pregnant. As you said, it is not uncommon to have happen. How life comes to be is truly miraculous and i do feel very lucky to have at least one in the oven. Don't get it me wrong, its sad that we lost a twin, but we are fortunate to have the one. Best of luck to you.
I too found out I had twins but I found out after one had already passed. So I didn't even get a chance to celebrate having twins before one passed away :(. My doctor contributes it to 'Vanishing twin syndrome' which usually happens before 12 weeks, most likely the cause of placental or genetic abnormalities. I found out it occurs in about 24% of all multiple pregnancies, yet I never heard of it before. I still grieve the loss of my one twin, as I am almost 11 weeks now. I found out I had twins/lost one twin about 2 1/2 weeks ago. My doctor said that this shouldn't affect my other baby because it happend before the 12th week. I'm just trying to concentrate on my one surviving baby and monitor him/her closely. What else can I do besides to stay positive for by baby and my 1 year old son? :(