Spotting,mirena IUD, BAD CRAMPS?

Um I had a baby on April 6,2011. I go the IUD in June 14,2011. I'm cramping really bad like it makes me cry. & I thought I started but I didn't like only a little blood was on my tampon. Well I'm kinda freaking out bc we use condoms but we have taken them off a couple times. He hasn't came in me but I guess the question is.. If what I'm going through is normal or not.