The last three days I have been waking up nauseated and it seems to last on and off through out the day.As soon as I wake up in the bed I feel like I am going to be sick. I have also been having slight headaches off and on too .My period ended a week ago, so I would find it hard to believe that I am pregnant and feeling the early symptoms off morning sickness. It seems too early in my cycle. Is it possible I could be pregnant? If not, what could be causing this?