the survival of the ovum isonly for upto 12 hours max after ovulation.
you may take a couple of acts before you become pregnant. wait for a month more or two. still if you do not conceive then you will have to get your male partner also tested for to rule out any abnormalities.
have good food. improve your nutrition. if you were on contraceptives you will need a couple of months post complete stoppage of the pills to get pregnant.
i hope i have answered your query.
i case of any doubts please contactat HCM.