iud, him inside, and smells

Okay so about a month ago I got the Paraguard, i had my normal period(I'm still bleeding faintly but it's like a pinkish gel) and I've been letting my love fun inside and there's now a gross smell that lingers and I have NEVER had this smells ever before. it legit smells like dead fish and its so gross because no matter how much I bathe or shower I doesn't go away. could it be him cumming inside?