I don't think you are pregnant - it would have shown in the blood test. I'd say it's a problem with your endometriosis and you should have it looked at. Your back hurting is a sign that there might be a problem and the breast tenderness and discharge sounds hormonal to me (I get both of these for a week or two before my period comes).
If your doc is not taking you concerns seriously you should get a second opinion - if your endometriosis is getting worse it could be causing these problems.
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