Jen and I went in for our appointment, and I was able to record little X's heartbeat running at 146 BPM! Everything seems fine and our next scheduled visit will be for an ultrasound in two weeks.
(unfortunately, Sony is specific in their format, and the software required to convert the recording to a usable format is hiding somewhere at home. i shall have to find it, install it, and then convert, in which case, I shall reply to this topic when it happens)