I am not using any form of birth control. My husband nad I had sex on day 14 of my last cycle. The week following I felt nausea everyday. On day 22 of my cycle, I started very light bleeding. (This was odd, because I my cycle is 28 day bang on, every monthwith 4 days of bleeding). The light bleeding continued to day 28 and then a regular bleeding flow started. I figured at that point that I had implantation bleeding and it did not take so I started my period. Which now has lasted 12 days. I was lighter for the past two days, then all of the sudden, it started heavy again this morning. I don't understand what is happening to my body.