Mirena IUD

I got the mirena on the 8th this month and I haven’t had a great experience with it so far. I have been spotting since (tmi but a brownish discharge with a little red too, it’s gotten a bit heavier this week) I got it with some mild cramps which I expected but it hurts when I pee, when I have my son on my stomach, and when I sneeze (or cough). I’m just wondering if I should be worried or if this is normal. I really don’t want to go back to the doctor if it’s normal (the metal thing hurts so bad)