Why are you having aweful lower back pains the period after a miscarriage?

If I am reading your question correctly, you have completed your miscarriage and having your first period post-miscarriage?

If this is what you're saying, then the lower back pain you're experiencing could be explained by a few things. If you've recently gone back on birth-control the hormone shift can cause you to have a more intense period than normal, but this should go away after about 3 cycles. If you're not on birth-control the back pain could be associated with your hormone levels which, depending on how long ago the miscarriage was, may not have returned to normal levels just yet. Its possible that the back pain is entirely unrelated to your period or simply that being pregnant (whether carried to term or not) can cause permanent changes in your body. Most women report that their periods are easier after being pregnant but some do experience a marked increase in the discomfort associated with their menstrual cycle. But as always, seek medical help if you feel this is a serious issue, and perhaps your doctor could shed more light on the subject.

Good luck and I am sorry for your loss. I too have had a miscarriage and I know the pain of losing a child (even one you didn't know you were pregnant with in the first place).