Mirena and pregnancy

Has it happened to you? If so how long did you have it in and what was the outcome?
I haven't bought a test yet (I'm buying it tonight after work) but I've had mine in since 3/2/17, everything has been fine until the last few days. I've been bleeding heavy, and it's bright colored, there has been chunks that are a mixture of red and like white and stringy almost jello like... 
Just wanted some personal experience, hopefully to settle my overactive mind 😳