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Once your cycles are regular you can plan for pregnancy
. Since you are on Letrozole
, ovulation can be expected 14th day prior to next expected period. You can expect ovulation on 14th day of a 28 day regular cycle. you may have unprotected sex on 13th, 14th, 15th, 16th day prior to next expected period for best chances of pregnancy. Best is to get ultrasound
monitoring of your dominant follicle in the ovaries. By 14th day prior to next expected period if it's size is 18-20mm it should ovulate and that is when unprotected sex can be done for high chance of pregnancy.