Ovulation-promoting drugs Headache, fatigue, weakness, injection site pain; chest pain; nausea; painful ovarian enlargement; abdominal bloating and discomfort; fluid retention; ovarian hyperstimulation syndrome HCG Enlarged breasts; painful ovaries; abdominal bloating; nausea, constipation; injection site pain; ovarian hyperstimulation syndrome Progesterone Breast enlargement and pain; nausea, constipation; headache, drowsiness; abdominal pain; injection site pain; vaginal sensitivity with vaginal dosing