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Due to lack of ovulation there may have been associated hormonal
disturbance and heavy bleeding. Until ovulation occurs you cannot get pregnant. Letrozole
is usually taken from Days 2 to 5 of cycle. You probably had early ovulation which is why you were asked to try for next cycle. Get proper ultrasound
monitoring from early in the cycle to see the size of follicle. The dominant follicle should be 20mm or more in size as this will rupture and help in pregnancy
after getting fertilised by sperm. The time ovulation occurs you can have sex and increase chances of pregnancy.