Nope I don't think you're crazy at all, I think we all worry about something during our pregnancies. Transverse or breech, leading to c-section, was the biggest fear for me too! Your bubble still has alot of room to scoot around in there atm so if it's anything like mine you'll be getting movements all over the place for awhile longer.

My DD was still transverse at 34 weeks, so naturally I was rather worried, but I started heaps of 'tummy time' every day with my fit ball. I would drape my arms over the fit ball, knees on the floor (on a pillow or yoga mat), say watching tv or similar, to achieve a 'hands and knees' position for 10 mins. Then I would sit on the ball and rock sideways and back and forward for another 10min. Did this twice a day every day from 34weeks and bub was head down within 2 weeks and stayed that way. But just because she went head down I didn't stop, I did tummy time every day until the day I birthed her. Next time I will probably start it a little earlier than 34 weeks too! I also made sure I didn't recline on the lounge, or even lay flat, always made sure I laid on my side when I did lay down to watch tv. Alot of people told me it was all hogwash and alot of overkill, but hey I believe it worked and actively doing something to help kept me in more positive frame of mind.