I gave birth last August 13, 2014, then i started having my menstruation again on the 1st day of November which only lasted for 2 days. After that, I had a menstruation last Nov. 22, 2014. It lasted for 4 days. On the last day of my menstruation, I took a daphne pill. My problem is that, until now, i have not experienced any menstrual period. I have already tried prenancy test almost every week but the result is negative. Please help me.