Anyone on here got pregnant On Mirena?

I have a 9M baby boy and 4yo daughter C-sections with both. I am not ready for another. A few months ago I tested positive on 3tests on mirena coil then they went negative after bad cramping and spotting Drs said had a pregnancy loss. I however feel I am now pregnant again same symptoms feel absolutely sick to my stomach craving and constantly hungry all the time and needing to pee loads.. I recently had a scan to say my coil was in place so I don't know how it could fail me but I have read a few stories on Google about it happening 😐

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