You need not worry about getting pregnant as your pregnancy
tests are repeatedly negative and you are getting regular cycles. Breast tenderness can be a symptom of water retention due to the hormone progesterone
, so also are the headaches
and nausea. You should see your gynecologist if your abdominal pain
bothers you severely for a complete evaluation. Also, if you are anxious to conceive, you can get proper attention and advice. Wish you good health.