How do you tell the postion your baby is in?

for the last few months she has felt like she was laying sideways i always felt her on my left anr right side but now i have been sittin at the comp for about 30 min felling her move like crazy and i just noticed that i dont feel her on iether of my sides i now feel her at the top of my belly and way down by my pubic bone could this mean anything i am only 31 w3d