Ovulation with IUD?

Hey guys! So I've had the Paragard for about three months now and all is well, but I've noticed weird symptoms around my ovulation times. I get really light cramps in spurts, my stomach is constantly making noises, and usually on the day I ovulate I get a bit of metal-smelling discharge. Did anyone else experience this, and is it normal? My doctor warned me about possible changes in my period, but failed to mention anything about my fertile window time.