How early did you start to get symptoms?

My husband just got back from deployment so this past month is the only time I could have gotten pregnant. Today would make me 10 days after ovulation. My boobs have been sore for 5 days, and i normally get soreness a day or two before my period but I am still 6-7 days away from getting my period. I am really tired like to the point where I can fall asleep so easily and I normally have insomnia. I also am cramping slightly. None of this would surprise me if my period was due any day. I took a test today just to see and it said negative but I also know its still really early so its possible it wasnt accurate. Has anyone else experienced symptoms this early? Thanks in advanced (: