Originally Posted by nauticalstar420
Well, lower back pain and cramping could be symptoms of pregnancy, unfortunately its hard to tell because they could be symptoms of PMS as well. Your best bet would be to ask your doctor for a blood test and see how that comes out. If it is negative, you might want to get on something to make your period regular.
You can get your period "one more time" even though you are pregnant. The way it was explained to me was (and if i'm wrong, someone please correct me), the sperm fertilizes the egg in the fallopian tube. If you are in the middle of, or just got off of your period, fertilization could have happened and not had time to get down to the uterus yet, so by the time it did get down there, a new lining would already be built up so the fertilized egg can implant in the new lining.