Hi , two months ago me and my ex had protected sex and i still had my period after that and the following month but earlier 26/12 , i was suppose to have my period on the 28/1 but i still don't have it and before that i was suddenly very active on excersing and always going to the gym and eat healthy( no junk / fast food and no soft drink) but because school have started i stopped for awhile and started eating fast food and drinking soft drink is it because of the sudden change of diet and my stomach couldn't handle? And thus causing some weird feeling in my stomach? i have not tested yet , is there any chance i am pregnant?