My cramps started about a week before my period last month and have continued since then. My breasts and nipples are sore and extremely fatigued, and I just started having some back pain. I tested negative on a pregnancy test 2 days ago, but my period isn't due for 7 days and since I had my implanon out I'm very regular. I think I tested early...should I test again? Or would a blood test show a week before period?