Hello there

I got Mirena 6 weeks after my son was born in January of this year. 3-4 months ago I started getting my periods again. ( stopped having them the first few months) at the beginning of the month here I had "spotting" for at least 2 days. I was figuring it as my period but it quickly stopped after hay short time. Now 3 weeks later I'm having ALOT of white discharge. I ruled out that it isn't a infection. Could I be pregnant? It worries me I could if I have Mirena