idk if im pregnant

ok so i did not get my period last month (June) Now its July amd ive been haveing some white discharge and cramps some are light and some are strong i am ttc so I would be so happy if i am pregnant...i have no tender breast or morning sickness but when i eat i feel like throwing up sometimes i cant even finish mu food i feel sick at night i get headaches so some plsss help me should i buy a pregnancy test??