Curiousity is piquing at me - do you have multiples in your family and are you or did you have them?
Since I was little I always said I wanted twins. I know they are hard work but I come from a family with a number of sets. My father is an identical twin, his younger brother and sister were fraternal twins (my aunt passed away 15 years ago), I have cousins on my mom's side that I *think* are identical but I've never asked about their blood tests. DH has cousins that are identical on his mom's side and fraternal on his dad's.