text: girls only please? i am almost a month late for my period and i went to the doctors for a pregnacy test and it was negative what cuold be the problem ive had this happen to me a couple of time but i dont think its a huge problem it can be triggered by change of eating pattern if you arent getting enough or if you have an infection but sometimes it just happens...  give it a couple more weeks but if you are really worried about it now go to the doc and see if you could have an infection