may be pregnant

hello well yes i am so confused. i can not firgure out if i am pregnant or not. usually my period comes 2 or 3 times a year so i dont know if i will skip my period or not becuase it is never the same month. i am thinking about getting a pregnancy test but i do not want my parents to find out. should i go to the doctors and ask them if i can take the test? should i take a home pregnancy test or are they not very accurate? i have no clue what to do i am very young and i am only in high school, i am not ready to have a kid nor do i want one at the time. i have been feeling a little different. my stomach was in pain for a couple of days, that could have because of something else we did but i am not sure. yesterday u kept having to go to the bathroom, i think i went to the bathroom probably 10 times yesterday which was not normal for me. my eating is not much different i mean the first 2 days after we did have sex i did not eat but that was becuase of my stomach hurting so bad. now i am eating more normal but i still have to go to the bathroom more that usual and alot of the time i just feel like i haev to go to the bathroom but alot of the time i either dont have to go or i just go alittle.... i dont kno wut to do because i dont want to tell my parents becuase i kno they will freak on me.i just have no clue i really need someones help because i cant seem to find anyone i would feel comfortable talking to and asking advice...