People always say that breast pain or tenderness is an early pregnancy sign. I'm wondering what kind of pain they feel. I am 4 days late & have taken 2 tests (1 the day I should have started bc I was anxious & 1 after 2 days late) & they were negative. Today my left breast, but not the right one, just started "aching" for lack of better term. I haven't had much breast tenderness or sensitivity with periods before & have never felt this. It isn't my nipple or even close. It feels like muscle aches in the deep tissue or something. Can anyone explain how their breasts felt different during pregnancy or at the beginning?!