Danni, my bub is breech and I was sent for an ultrasound at 36w to check because they weren't sure seeing as they thought he was head down for the last 3 visits. The movements you mentioned sound like what I get. I have a hard ball up top that moves from side to side and it's almost a burning pressure sensation and I have heaps of what must be foot/leg movements on my left hand side, and sometimes down in my pelvis.
If you still suspect he's breech in a few weeks I would be asking to be sent for an ultrasound to double check to put your mind at ease.