Is it good to have intercourse every day after taking femara, (letrozole) still i don't know when i ovulate?

Its not bad: Get an ovulation indicator kit or chart basal body temps

Reasonable : This is a reasonable approach if you are not being monitored. If your doctor is monitoring you with ultrasound they can better focus on when you should be trying.

Yes : ;-) All kidding aside, you have to be having sex to get pregnant. You are probably using a routine 5-day course of Femara (letrozole), (letrozole) and will probably ovulate (if it makes you ovulate) 7-14 days after the Femara (letrozole) ends. So do your due diligence!