I have done sex four times & first time it is unprotected and second time it is protected then last two times it is unprotected and after having first sex I have taken I pill and after second sex which is protected I have taken unwanted pill and last two times I have not taken anything and after all this shit I have done test after four to five days and which is normal that I am not pregnant but still periods are not happening I do not know why. My health is ok no vomit is there no nothing but periods are not happening please help me out from this.