please help! i am 17 and 13 days late ......i was 10 days late last month with period like cramps and eventually got my period, turns out i am late again by 13 days WITHOUT cramps, ive been feeling very tired and sometimes get a wierd feeling in my belly. i was due Nov 17 and still no period, i took a test yesterday and it was negative! i feel like i am going crazy :( people say it could be just a phantom pregnancy, (where i am tricking my body into thinking its pregnant) although i have hardly any symtoms what so ever!, please help