Pregnancy starts to count before conception
Pregnancy starts to count before conception

www.themotherbabycenter.org
Trimester timeline: calculating pregnancy weeks to months - The Mother Baby Center

The time of pregnancy is calculated from the first day of your last menstrual period (LMP), which is typically two weeks before conception actually occurs. This means the first two weeks of the 40-week count are before fertilization, during which your body prepares for ovulation and a new cycle begins