Various examinations and time requirements 1.Day 2-4 of menstruation: blood sampling for basal hormone levels (FSH, LH, E2, T, P, PRL), ultrasound to assess ovarian basal status, fasting blood sampling required. 2.3-7 days after menstruation (no sexual intercourse): hysterosalpingography and tubal imaging, laparoscopy, hysteroscopy. 3.7 days after ovulation (equivalent to the 21st day of menstruation): blood sampling for progesterone level. 4.From early follicular phase to confirmation of ovulation: ultrasound to monitor ovulation. 5.Non-menstrual period: vaginal discharge examination, cervical lesion screening (TCT). 6. Semen examination for male partner: 3-7 days abstinence. Note: FSH – follicle stimulating hormone LH – luteinizing hormone E2 – estradiol T – testosterone P – progesterone PRL – prolactin