i'm going through exactly what you described right now. i've also had some nausea at times and my face gets kind of hot and flushed. i also have some kind of new pain in my inner thighs that feels like i've pulled muscles on both sides and i can barely walk. oy.
mine has been going on like this for about two weeks only getting slightly stronger and happening slightly more often. it seems to go away a little when i lie down. it's a little bit annoying really but i can still feel the baby moving so i'm hoping he or she isn't too squished in there.
i guess i kind of just repeated myself. lol. pregnancy brain.