Take a test, cause all your symptoms could be your reg cycle just worsened, or pregnancy, also there is a poss that you could have had a chemical pregnancy, which means you were preg real early and lost it quick, that could be why you have all the bleeding, so even if you get a pos urine, go get your blood checked and be pos, before you get excited, this happ to me and i thought i was preg for two weeks and they said i was not when i went for the blood, and 7 days before i had a pos urine, so it was either a faulty test or i had a chemical preg, and was preg for a real short time. Good luck im sure everything will be fine!!!
Irregular bleeding and irregular colored discharge can be a sign of infection, which can also delay a period, and cause lower back pain/cramping. This could very well be what is wrong. Either way, irregular bleeding and periods should be discussed with your doctor. You can take a HPT and get a positive anytime now if you are pregnant (first morning urine works best). Good luck!