A woman can easily ovulate a lot sooner or later than expected, even if she carefully tracks her ovulation
by the correct means(not a calendar
). If you have had sex, you might be pregnant. You can take a home pregnancy test 2 weeks after having sex or after a missed period, as both should give you an accurate result. Take a test at the right timing and use first morning urine, then go from there. Are you trying to get pregnant?