I am 24 years old,I do not have unprotected sex at all and this month I did not have sex except that my bf tried the anal sex on my 6th day of the last period but he did not penetrate at all. my last period was 1-10 and up till now my period was late on 23-10 i had like brown spotting and felt kinda as if my period is about to come but it did not..may b i am kinda stressed about it.I just wanna know y my period is late!!