We found the source of the spotting. Under a gestational sac there was a little tear. Apparently something about as the placenta entrenches itself and grows, it sometimes tears a little bit of the lining, or something like that.
Honestly, I missed some of the finer details of the explanation. I was a little busy reacting to seeing 2 gestational sacs with yolks and fetal poles, firmly attached, and currently at the right size.
Apparently those little tears and thus a little bit of spotting is more common with twins. We don't know if they are identical or fraternal, but each has it's own individual sac which is a really good thing.
In six days when I go to my regularly scheduled ultrasound and we can see the heartbeats, dancing in the streets shall commence. Right now, I'm just kind of shaky. A little bit of coming down from fear, and a little bit of being elated at twins again.
I'm almost ashamed of myself for being SOOOOOOOOO fortunate to get this kind of lightening strikes twice do-over when so many others are struggling. I feel like a Survivor contestant who's won a reward and gets to pig out on all sorts of goodies in front of the other starving contestants. I'm thrilled for me, and just so sorry that I can't spread the wealth around.
Well, for the moment, it looks like this blog will be able to fulfill its original purpose - to document becoming parents for the first time to twins. Please, let me get it right this time.