KMH im not sure how good those are??? I know a friend had hers taken out and see fell pg before she even got a period.. Had to have a date scan to work out how far along she was and she was neally 6 weeks basically fell pg a week or so after it was taken out.. Is it close to when it should be replaced?? (not sure how long they last) I also had a friend fall pg when having the injections 3 mthly......