Do you know what day you ovulated on? If you o'd later than normal pregnancy is possible. If you ovulated when you usually do then it is unlikely you are pregnant if a serum hcg is negative. However stranger things have happened.
The hormone progesterone causes breast tenderness and some early pregnancy symptoms but it also causes pmt. What you are describing sounds like it is the beginning of your AF. The breast tenderness is consistent with pregnancy but it could also be from the higher level of progesterone that we have in the second half of our cycles. The progesterone levels drop just before af arrives.
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