hello tina,
welcome to hcm
thanks for the query
have you husband performed his semen parameters?
if not , do this test. also are you maintaining sexual relationship during the time of ovulation?many couples do not follow this basic.so try to maintain relationship during period of ovulation without fail
you can know your ovulation time by performing test through ovulation kits available in market.you can do it your own in home.you can also know it by doing follicular study by your doctor through usg.he will give you the exact time to maintain sexual relationship from the follicular study
also do tests for cervical factors like detection of sperm antibodies through tests called sperm agglutination test
if you are obese or over weight then try to reduce it by doing regular exercise and diet regulation
hope this information will helpful to you
take care

From your history I can gather that you hav problem conceiving inspite of all your tests being normal.Usually this canhappen in patients with subclinical PCOS.If your periods are normal bringing down your weight to the ideal weight by exercise like running on a treadmill and abdominal crunches can help .The ideal weight can be calculate by the formula (your height in cms-100)*0.92.You should take around 2 litres of water daily with a lot of fruits .If you have difficulty in reducing your weight you may have to take T Metformin 500mg once daily to twice daily (depending on the amount of weight you need to lose) to supress your appetite and help in weight reduction. If your weight is within the ideal weight there will be no problem in conceiving.If everything else fails you can consider in)vitro fertilization