Should I be having heavy spotting everytime I have sex?

I'm on the Mirena anytime I have even gentle sex I get heavy spotting the next day along with small cramps. Is this normal? It doesn't happen if I don't have sex 🙁. I took a pregnancy test today and it was negative. Should I be concerned? I also breastfeed and I know that makes the chance of perforation/shifting on the device 6-7x higher based on the inserts. Has this happened to anyone?

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