Hi. I Have Been Prescribed Letrosoul(Letrozole 2.5 Mg) After Approaching

Hi. I have been prescribed Letrosoul(Letrozole 2.5 mg) after approaching my dr for getting pregnant. I have a combination of regular and irregular periods. This is the cycle of my periods after my wedding. My wedding was on 31/08/2014. My concern is while checking the internet I was shocked to see that letrozole is used for treating breast cancer in woman and that one should not take while trying to get pregnant. Is it still safe for me to take it or should I stop using it. I had already taken 3 days of this tablet(2.5mg*2*3) as dr asked me to take 2 tablets of 2.5mg per day.
14/08/2014
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