Ovulation, and therefore conception, occur 14 days before your period was due and you can get pregnant from making love up to 5-6 days before
ovulation happens. If you have a 28-day
menstrual cycle -- which is assumed by many healthcare providers -- that means that you ovulated on day 14. If your cycle is a few days longer, you probably ovulated after day 14, and your baby may arrive a few days after your estimated due date.