Hooray! After my disappointing progesterone results, I managed to move up my appointment to Friday afternoon. My doctor's office doesn't have an ultrasound, and I knew that 9 weeks was about the earliest we'd be able to hear the heartbeat with the Doppler. Friday was 8w6d, and after a few minutes, he found it! About 170-180 beats per minute. What a fabulous sound!
At the last minute, Mr. X was able to make it to the appointment, too. Not only did he get to hear the heartbeat, but he also was able to wrangle the kids in the waiting room for the delightful p.e.lvic exam time (I was really nervous about handling that without him!). So, everything's looking good, thanks be to God!