taking a test

i was supposed to get my period sept. 16.. a week before i had brown spotting that lasted about a week..my period never came and then a week later more brown spotting on and off for the past few weeks..now im getting sharp pains on my right aide..not bad but noticable. i took a test sept. 23 but none since..i dont know if i should take another one or when i should. since everythings been crazy with the spotting dont even know when my other period is supposed to be.