Suggest Treatment For Infertility While Having Pcos

i had my periods on 6/3/11. i went for pregnancy test and it was negative on my 48 days. at that time i was 61kg weight and my height is 154cm.i went to a gynacologist and they diagonized as PCOS.Then i reduced my weight to 57 and i got my periods on 21/5/11.i got a fish like structure in the first day of my mensus..what it may be?what else i have to do to pregnent...