Your gynecological report is normal but you are overweight
. Your husband should also be evaluated for infertility
and then if he is also normal, you should be checked for incompatibility of blood groups, semen and antibodies
. There is a condition called unexplained infertility when everything seems normal but conception fails. In such cases IVF or IUI is advised. All these should be done under the guidance of an infertility specialist. So please see such a doctor. Good luck.