How likely is it to get pregnant while on the Mirena?! I have did 2 pregnancy tests and their both negative but my period is a month late and the month before it came a week early. The most I have ever missed it for is 2 weeks and it's going on a month next week. I still have cramping randomly and my breasts are fuller and I have gained a little bit of weight but I have been eating alot more plant based protein. Does anyone know what the deal may be here. Has anyone had their period suddenly disappear after being on it for 4 years... I had the tiniest bit of dark spotting but that's it...