My Period !!?? How can this be, I am only on cd 20. I called my study coordinator this morning and she told me another girl in the study at their office had this happen too. The doctor thought in her case it may be implantation. So she said don't worry about it. Its good news or its just nuisance. I held high hopes but as the day goes on and it is light for a period but more than spotting and it is now red. Only the next few days will tell.