I get sore boobs too in every cycle and it just stops after AF till ovulation. My cycle has also become irregular since (20-25 days) then. Earlier it was clockwork (30 days). But pain is always in left breast and it worsens when I lie flat. Anyone else feeling the same the way? I consulted my gyno for same and she mentioned it is due to hormonal fluctuations because of vitamin deficiency (mainly vitamin B6) and gave a course for one month. It sorted out for few months but came again after stopping vitamin pills. Sometimes I feel it is just not related to AF and fear of something else. But pain always goes away after AF; just to return back few days prior to AF (after ovulation).