Why is my period late?

my period is 13 dayz late what do that mean?..I have no signs of being pregnant..I had diareeah..and lil cramps

take a pregacy test and go see your doctor asap becuase it could be a clot or someting bad. It would not hurt at all to go see him/her

id say take a pregnancy test. I get missed periods all the time, and I know im not pregnant. someimes my period is late, or sometimes it doesnt come for a few months. but im fine, so I dont think its bad. sometimes that happens