funny... down there.... 😩

I feel really self conscious now... 
     up until last night my man would go down on me and not say anything negative, but last night he said I didn't taste nice... he said it wasn't pleasant yet I was clean as I had a shower just before.
 I do wonder if it's my contraception which is making my bodily fluids "change". I've was checked up at my doctor 2 weeks ago and was told all was well. 
So what's going on? 😩😩😩
P.s I'm on the mirena (aka 5 year coil)