Snapshot A 27-year-old woman presents to her primary care physician due to missed menses. She reports to having a 28-day menstrual cycle with minimal variability, and her last menstrual period was 7 weeks ago. She reports morning sickness and is currently sexually active with one man and use condoms intermittently. Physical examination is unremarkable. A urine β-hCG test is positive. (Pregnancy) Introduction Estrogen login to view 16 more bullets Progesterone login to view 8 more bullets Oogenesis login to view 4 more bullets Menstrual Cycle Follicular phase (days 1-14) login to view 7 more bullets Ovulation (day 14) login to view 6 more bullets Luteal phase (days 14-28) login to view 7 more bullets Menses (days 0-4) login to view 2 more bullets Pathology login to view 5 more bullets Pregnancy Fertilization login to view 2 more bullets Human placental lactogen (HPL) login to view 2 more bullets Physiology login to view 12 more bullets