My LMP was Feb 17th. Around March 2nd, two weeks after I started to notice pretty painful breast tenderness. My withdrawal bleed is due on March 16th, basically two weeks after the tenderness started. I'm still feeling it, although it has gone down a little. Just wondering if it's possible for pregnancy symptoms to start that early? I'm also on the pill and this is my 3rd month of a new brand, but the tenderness has never happened this early to me before. If I take a blood pregnancy test now, will it be valid since it's still 3 days before my expected bleed?