if prolactin and thyroid levels are normal and you still have not conceived, best do an evaluation
for other causes of
infertility, including a semen analysis, HSG to check fallopian tubes and uterus, and FSH and estradiol levels to evaluation ovarian reserve (how many eggs you have left). if all this is normal, and you still are not getting pregnant, seek treatment for unexplained infertility, with clomid and iui's or FSH and iui's. good luck and don't give up hope.