Gynaecology & Obstetrics In Pearl index formula, Pregnancy rate per HWY: A Total accidental pregnancies x 1200 / Number of women observed x Total months of use of contraceptive B Total months of exposure to unintended pregnancy X 1200 / Accidental pregnancies C Total accidental pregnancies x 100 / Number of women Total months of exposure to unintended pregnancy D Total accidental pregnancies / Total months of exposure to unintended pregnancy 💡 Explanation In Pearl index formula, Pregnancy rate per HWY: ✓ Correct Answer: A. Total accidental pregnancies x 1200 / Number of women observed x Total months of use of contraceptive