I am 23, 51 kg. I had unprotected sex a day before I got my period (on the 38th day of cycle). It lasted for four days (normal). Today is the 13th day from when my period started and I am getting bad backache, my breasts hurt (usually happens just before period) and sticky egg white discharge. Am I pregnant or is it ovulation? I had taken a pregnancy test before I got my period because I was late and it was negative. I have mild PCOS. So, my periods are never on time but happens every month. Is it possible to be pregnant after you get your period?