Do you actually get pregnant before your LMP or after your last LMP?

Pregnancy is calculated from the first day of your last menstrual period (LMP), but conception typically occurs about two weeks after that, during ovulation. Therefore, you are not actually pregnant before your LMP; pregnancy begins after your LMP when an egg is fertilized following ovulation. The gestational age of a pregnancy is counted from the LMP to provide a standardized way to track development.