A late menstrual period is the first serious sign of pregnancy but it is not always a secure predictor of pregnancy. Instead, to be sure, you can take a home pregnancy test to confirm or exclude pregnancy. Having sex every night gives you good chances to conceive. If you have sex every day you can’t miss the fertile days of your cycle. The fertile days are the days around the ovulation. Ovulation happens about 14 days before an expected period comes. In a 28 day-cycle the fertile days would be in the middle of the cycle.