Sharlene Lowe answered 3/15/2011 Is There A Chance Of Getting Pregnant After Having Unprotected Sex On Day 21 Of Menstrual Cycle? I had sex on the 21st day of my cycle and I have a 35day cycle I have had some cramping and very sore breast my nipples are a little tender could I be pregnant? I'm not due for my period for another week?