You might want to ask other women that have had the procedure. The Mirena coil is a small plastic T-shaped device that is placed inside the intrauterine area in females to treat them for...
If the operation was successful then no. The coil would be superfluous. That being said there was one occasion when a child was supposedly born to a virgin
Yes, it happened to a relative of mine. She'd been trying to conceive for 6years, gave up, had a coil fitted and became pregnant. Nothing seems to be 100% failsafe.