Hey sxcy,
it's probably the top of your uterus- you should be able to feel that by now.
The hard bit will continue to rise above your pubic bone by about a centimetre a week- so if you are say, 16 weeks, it should be 'round about 16 cm from your pubic bone. (give or take)
the painless braxton hicks contractions that you're also talking about happen all the time during pregnancy- I didn't notice until very late in my last pregnancy, and I could only really feel it from the outside- my whole tummy would be hard. This time I can actually feel it starting sometimes, and know when it's finished-and i'm only 24 weeks !!!
I'm also getting kicked to death already, and kept awake at night too.
Feels like there's a baby horse in there, not a little girl !!!!!