I am on CD 21. I have been having multiple symptoms in the 5 days or so. I have had a backache everyday, fatigue 3 of the days (way more tired than I normally am and I have been getting the same amount of sleep as I always do), I have had some heartburn every day, and was very moody yesterday. I really hate having to wait another week before my period should be here to take a test. Do you think I could be pregnant? Has anyone had symptoms similar this early?