quickening vs cramping?

Hi Mommys and Mommies to be, i really wonder kung ano bng feeling ng gumagalaw si baby sa tyan? Wala kc akong nfifeel na galaw. Ang meron ako is occassional cramps sa puson. Dko mdifferentiate ang cramps sa movement nga ba ni baby. Im already 20weeks. Im afraid something might be wrong. Last week's checkup, everything was normal nman. Dpat ba talaga meron ng gumagalaw sa tyan ko at this point? Its my first pregnancy..