Is it possible to get pregnant on the iud and while breastfeeding ?

I’ve had the iud since December and I have been breastfeeding since September. I haven’t had a period since I gave birth but I do get spotting and cramps. Usually after I have sex I bleed and get cramps because my boyfriend knocks my iud around and irritates everything. Is it possible to get pregnant? I’ve been feeling off, like I did with my last two pregnancy’s. I think it’s near impossible but my boyfriend thinks it’s very possible.

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