3 days late, IUD and sharp pains.

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I'm three days late, and what's weird is that I'm on the paragard IUD. I've let my bf cum in me but this is the first incident this has happened, I'm kind of scared.... //// I have this really sharp pain on my right side, it's been like this the past couple days, i think it's where my tubes are too... it's so bad it makes me keel over in pain and almost makes me cry. No signs of a period either and cramps aren't a thing for me, never have been until I'm actually on my period. I took a test and it was negative. the pain on my side is actually bulged out a bit when you feel there compared to the other side.