Tomorrow is my first ultrasound. I found out a few days ago that twins run every second generation on my dad's side for the past 18 generations (is what I was told) and I'd be the 2nd generation.. I just today found out that my husband's Grandmas cousins are twins (and a few generations before them there were twins). What do you guys think the chances are of my having twins? I know the only way to know for sure would be an ultrasound, which I have tomorrow. I'm just curious what my chances might be....