So my period is 12 days late now and i'm confused as to what is going on. I am hoping that people can give me some advice on this. but in order to so do i guess i will give some back ground on my situation.

Since September 2010, i have been having menstrual like cramps all month long. i have finally gone to the doctor, but we are still not having success in figuring out what is wrong (i have done a CT scan and blood work for all sorts of thing - i am still waiting to hear back on my test for Celiac disease). on top of the menstrual cramps, my period has been a little irregular, but even with the irregularity it was still predictable. for instance, December i got my period on the 10th. January i was expecting it on the 10th, but it didn't happen. it was exactly one week late (got it on the 17th). the next month i got it on the 17th as well. now this month i knew one of two things was going to happen. either i would get it on the 17th, or i would be a week late.

Before all of these health issues began happening, i was able to determine my period by the menstrual cramps (usually started a day or two before my period would start). Then when i couldn't rely on the cramps, i started paying attention to my breasts (they would get sore 2-3 days before my period would start). This time around it has yet again failed me. Around the 17th, when i was expecting my period, i had sore breasts and bloating and cramping (of course) so i thought for sure i would get it on the 17th. When i didn't i thought i would get it on the 24th, but of course i didn't. it is now the 28th, and i still do not have my period. i still have sore breasts and starting on the 17th i have been feeling nauseous.

Another thing i should add is I am not on any type of birth control, and my husband and I do not use condoms. We were trying back in July 2010 up until December 2010 but did not have any success, so we decided to stop. this past month there may have been one time when we "let one slip past the goalie". but because of our past history with trying, i didn't think anything of it. I have taken 3 pregnancy tests and each one has come up negative. so again, i thought i would believe the tests. but now that my period is 12 days late, it has me wondering if there is the possibility that i could be pregnant, or if it is just my current health issues reeking havoc on my menstrual cycle. I was hoping for some feedback on this, or if anyone could give me some advice it would be greatly appreciated - any bit helps.