When should you be concerned about too much fetal movement?

I am currently 15 weeks pregnant, and am feeling a lot of movement. At least 3 times per day, I feel movement so strong it is sometimes painful. Most of the movement is above my belly button, and it usually feels like quick, powerful punches or kicks. This is my fourth pregnancy, and I don't recall feeling anything this strong this early before. At one point, it happened while I had my 21 month old on my lap, and she jumped!

I have no other oddities in the pregnancy, and the nurse in my doctor's office doesn't seem concerned…should I push to talk right to the doctor or let it slide? Has anyone else ever experienced anything similar?
extra details:

I've been feeling these movements for several (5?) weeks now. I didn't think the baby should be as high as what I feel. The nurses stated it sounds like I'm further than I think, but I've had two check-ups, and the doctor said I was measuring right on target.
I am 5'6 140lbs. Not big, but not petite either. I've only gained 3 lbs so far.