I started testing cd8 and stopped tested cd20 after no positive OPK. When my period didn't show up last week I assumed I was pregnant and missed my surge, but got a bfn. However, two days later I had egg white cm on about cd26 and about three days after that I had sore nipples. I am a week late and no sign of AF. Is it possible I ovulated that late and that's why I am missing my period?