I had implantation bleeding on December 2 I also had been having back pain headaches and feeling like I need to nauseous. but I took a test and it came out negative......then on December 6th me and my.boyfriend had sex butbit felt very painful and after I didnt feel so comfortable to sit or lay down then the next day December 7th I had spots of.blood in my underwear (as I believe that was my period) but I didnt have any cramps earlier in the day (I had light bleeding I barely noticed it and it was a red but it's normally a dark red with black) but my expected day to start was on the 8th .....is it possible to have implantation bleeding and get your period in the same month and could you have implantation bleeding more than once in a month?