PLEASE HELP

hi ive been travelling for 2 months now (currently in Thailand) AND my period is more than 4 weeks late now. i took 2 home pregnancy tests on 2 different occasions, both came negative. i havnt been sexually active since my last period. my flight home is in a month. i dont know what to do. usually my body wroks like a clock... could you please tell me what should i do. thank you

this forum is not dealing with such questions.