Hi, I appreciate your concerns. If you have not conceived even after trying for three years, you need to to find out the cause for it first. It is good to know that your BMI is normal. Are your menstrual cycles regular? To increase your chances of conception you need to have intercourse at least three times in a week and quit smoking ( if smoking). Folinz in addition to zinc contains vitamin folic acid. This vitamin reduces the risk of baby having brain or spine abnormality. Therefore all women planning pregnancy should take this tablet. It is important that you and your husband should see gynecologist and do baseline infertility work up ( hormone test and fallopian tube patency test for you and semen analysis for your husband). Based on the results of investigations treatment can be planned. Clomid is a tablet given for women who do not ovulate on their own. If you are taking this tablet you need to do serial ultrasound in the first month to make sure that you are ovulating and not responding with development of too many eggs. I hope I have answered your concerns.