Im 17 and i haavent gotten my period and ive been havin unprotected ?

ever since i started getting my period it neva came on the same date it came on last month it came whenever it wanted to.andnow its the the end of the month and it still hasnt come yet.ive been havin unprotected .i want to know if im pregnant but i scared to find out.and can i get an abortion in my state without my parents knowing.