Well that definitely doesn't sound like a normal period. If you have extra tests on hand I would test again this coming week, maybe mid week or something. Or go to your doctors and find out what's up. It sounds like something may be going on because thats a super light period if ya ask me! Good Luck Hun!
Oh that could be implantnation bleeding sweety i would definatly get a blood test done at your doctors that way you will know. My last pregnancy was just like you have described and i was pregnant. Good luck sweety xx