 [ Symptoms ] does mirena iud cause false negative pregnancy tests  i got the mirena iud january 10 2012 after 6 months my period stopped completely for the last 6 weeks though i have been experiencing pregnancy symptoms similar to those of my first pregnancy i have taken 3 at home pregnancy tests and all were negative but my symptoms are intensifying fatigue nausea occasional abdominal cramps weird bumps in my belly almost like a heartbeat headaches loss of appetite increased gaseous output [ Disease ] you need to call your gynecologist as soon as possible to determine if you are in fact pregnant or if you are having trouble with your iud an intrauterine device iud is considered an effective birth control method so you should not be able to get pregnant however no form of birth control is 100 foolproof if you are pregnant and have an iud it is important to get a diagnosis as soon as possible you can not go through an entire pregnancy with an iud in place it is also possible for an iud to become dislodged or penetrate the uterine wall in short a number of scenarios could cause the symptoms you describe and you need to find out what is going on as soon as possible best wishes to you