I had my first baby six months ago. I have been exclusively breastfeeding (with pumping while she is in daycare twice a week). My menstrual cycle returned for the first time on November 20th. Then I started what seems to be a period just two weeks later. I'm wondering if that is normal, or if something could be wrong? The bleeding is very similar to the implantation bleeding I had with my last pregnancy, but it started just four days after having sex, which makes me think it couldn't be this time...