I'm 13 days late now. Every time my boyfriend and I had intercourse we used a condom and it never broke. But we never had sex when I was ovulating. I was suppose to start Dec. 16 but nothing. The only symptoms I'm having are lower back pain, pelvic pain and sore nipples. I took a pregnancy test Dec.22 and it came back negative. Maybe I'm just stressing but I'm so clueless!