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Hmm. My Mirena stopped my periods, but prenatals never made my periods heavier. I took them for hair growth for a couple years.
The mirena is pretty springy and is unlikely to be squished. They can imbed, and that's a pretty small stat, but they can cause ectopic pregnancy, so if you really are on the try again train, pop that sucker out.
The progestin should regulate within a couple months, but ask the gyno.