Today's visit to the OB proved that I am, in fact, paranoid. I felt pretty sheepish when I learned that everything is fine and there's nothing to worry about, but it's far better than finding out that there actually is something wrong.
The increased frequency of the Braxton-Hicks contractions is apparently normal. I'm supposed to drink more water and lie on my left side to make them go away. My cervix is shortened a little but still nicely closed, perfectly okay for 33 weeks.
The doctor did a very quick ultrasound to check circumference of head and belly and length of femur - all are measuring ahead by dates, but we expected that because of the fundal height measurements. Current estimated weight is 5.7lbs, not much smaller than my nephew was at birth.
I embarrassed myself during the ultrasound. Lying on my back does not work well for me. The doctor commented calmly that I appear to be quite sensitive to it - I was thinking frantically that there was a good chance I'd pass out right there on the table. Fortunately he let me lie on my left side for a few moments and I recovered, but I'm now prepared to be exceedingly grateful for every minute in which someone does not force me to lie on my back.