every month, i miss periods for 10 to 15 days and get all the symptoms of pregnancy, cramping, back ache, nausea, i take HPT every single month after my marriage seven months before. this month also, i have already taken a pregnancy test and turned out to be negative, but still do not hav my periods yet. i hav nausea and back pain and cramps below my ribcage. how do i really know if i am pregnant? i really do not want to run to a doc every month if it is only a doubt, bcose they do all sorts of tests and i will become bankrupt. what are the reasons why when we are having sex every day after my periods to the next periods and still does not get pregnant. does diet play any role in this? please help out anyone, i'm really new to these problems