The only thing that means you're pregnant is a positive pregnancy
test, blood test, ultrasound or
Humans have food cravings, this is not by any means limited to pregnancy. Fatigue also happens, and is just a part of life. I sleep 12 hours a day and could sleep more if I was able to and I'm always tired. Back pain can be caused from pinched nerves, poor sleeping habits, the bed you have, improperly lifting things, carrying heavy things, etc etc.