HI. I recently started a diet pill called oxyelite and am on birth control. I also had a baby about four months ago. I still have three days left of this cycles birth control pills and haven't started my period yet. I had a period last month and the month before that with no skipping of birth control. Took three tests the last few days and all were negative. Could the oxyelite be causing a problem with my periods? Or should I be worried of a false negative test results?