I am wondering if anything can cause a pregnancy test to come up negative even if you may be pregnant. I just turned 40. I have always had very regular heavy periods. I had no slowing down and all of my last periods have been normal. Then about 2 1/2 months ago they just stopped. I have been feeling bloated and peeing a lot. But I have taken 3 test so far and all are negative. I am just wondering if any medications could cause test to say negative when you could be pregnant. I can not get to the doctors until next week. So if you have any ideas or a list of medications or any reasons this could be happening I would appreciate it. As I mentioned I have been tired feeling bloated and peeing. All the symptom's. Just negative test results.