I seen you haven't had anyone respond yet. Have you said anything to him yet? I have lost 3 pregnancies before, and thats what it sounds like to me. Then again, if you just had your IUD inserted, it could just be spotting from that. The sore boobs and such could just be your body's way of adjusting to it. How long have you had the IUD? Did they check to see if you were pregnant b4 inserting it? Assuming that you had a miscarriage, be honest with your boyfriend. If this is a relationship you want to continue with in the future, don't start your life together hiding things from him. I think it depends on the status of the relationship, but I am not a DR, so this isn't a professional opinion. Good luck though. As far as the IUD, bad mistake. All women are different, so we all act differently to different birth control methods. Personally, I gained 40 lbs in 18 months and had bad acne. I'll never do the IUD again and will never recommend it to anyone. No periods was great, but not worth everything else, and when you think about it, periods are a woman's way of cleaning out her body. Again, Good Luck and let me know how things turn out.