Pregnancy begins with conception, lasting about 266 days in humans. Fertilized egg (zygote) implants in uterus lining after three days. Placenta forms and transfers nutrients to developing fetus. By nine weeks, fetus is recognizable with organs and structures
Due date is calculated by adding 280 days to last menstrual period. Naegele's rule was created by German obstetrician Franz Naegele in 1812. Calculator uses either period date or ultrasound scan for more accurate results
Belly becomes huge, making position changes uncomfortable. Baby's head has moved down into pelvic area. Frequent urination and vaginal discharge with blood streaks. Belly itching and increased contractions. Weight stabilizes by 38th week
Baby is 37.9 cm long and weighs 1.2 kg, size of a coconut. Can smell and make faces, developing rapid eye movement sleep. Organ systems continue maturing and senses refining
Baby drops lower into pelvis, causing increased pelvic pressure. Frequent urination and swollen legs are common symptoms. Tingling and numbness in hands may indicate carpal tunnel syndrome. Back pain and pigmentation changes are common. Stretch marks may appear on skin
Peripartum refers to the period immediately before and after childbirth. Antepartum refers to the period before childbirth, from conception to labor