It was definitely worth the trip. Dr. STN checked the baby's heartbeat first, to make sure Lil' Scrappy was okay. Then he did an internal exam to confirm that the blood was coming from my uterus, not some cervical surface irritation. So what's the cause? Dr. STN basically said "I dunno". Sensing that I was still a little uneasy, he asked whether an ultrasound would help ease my mind. "Uh... yeah!" The crazy IF lady got her bonus ultrasound! He didn't take measurements or anything, but could see that Scrappy is about the right size, moving around and stuff. The placenta isn't low-lying or otherwise weird-looking, so there's no apparent reason for bleeding. So I didn't get any explanation, but am very happy to know that there's nothing obviously wrong. I'll take it!
Keep your fingers crossed that I wake up tomorrow with no more spotting. Help me achieve my dream of a drama-free pregnancy!