I have identical twin daughters and I have a "twin" thing, too
I have always had this lonely, "I'm missing someone" feeling, especially as a child. I have also had a huge attraction for twins. As a child/teenager, I was friends with about 8 sets of twins (over the years, not all at once), which I think is quite a few sets--especially because this is during a time when there were very few instances of fertility treatments, etc.
But anyway, when I was seven weeks pregnant during my third pregnancy, my doctor did a routine sonogram and discovered that I was carrying twins. I still remember feeling very "deja vu" about the whole thing--but I was still shocked. I exclaimed, "We don't have any twins in our families!" and my doctor said, "Well, you do now!" I have always pondered how I ended up having twins, when I really never conciously thought about having them. I don't think it's a coincidence. I think I might very well have had a twin, or maybe I just think it would be so cool to have a lifelong "partner" and I thought it to such an extreme that I somehow subconciously influenced the pregnancy? Just a thought. There is a really good book called
Having Twins (I forget the author and I'm too lazy to look it up) that really does give credence to that idea.
According to my doctor (and many books I have read, etc.), it is very common for pregnancies to begin as a twin pregnancy and then, for some reason, one twin is "absorbed" into the mother's body. In fact, my doctor gave me a long warning talk on how this might happen, and how if it did, it wouldn't be my fault, etc. I was also on an online BB for twins at this time and several newly pregnant twin mothers had a twin either die or "vanish." We are just more aware of the existance of multiples now that we have early sonograms. Many of us might have begun life as a twin.
Fortunately, my twins both survived and they are now almost six.
Kim