I dnt think there is any drugs for such,what u will do is to calculate ur ovulation and at the early stage of it u will start meeting wit ur spouse at least 3 to4tyms in a day reason becos d speerm dat form a male child are very fast,active and easily die wen traveling to d tube while d sperm dat form d female are also active,some tym slow BT can survived for up to 3days in d human bdy.so its a logic for some to calculate an get it rgt and above all add God in it(prayers). bye n gud luck.