Worried ?? IUD Kyleena

Past week been having some yellow discharge .. i thought it was a sign of my period making it way ...

Took a First Response Early Pregnancy Test Wednesday ( Two days before my period)

& it was NEGATIVE and now my i guess started Thur/Friday BUT my flow is lighter than usual...

Is this possibly from the IUD or something else could be wrong ?

I’ve had Kyleena since July 2017