Hi my partner and I have been trying for me to get pregnant for the past three months. I am 40 years old, physical exam excellent and I've tried the fertility test and shows I am fertile. Don't know why I haven't been pregnant yet? I do eat tuna four or five days a week...could this prevent me getting pregnant? I also drink three cups of coffee daily. I also notice I am always tired lately and get foul smell often. I take multivitamin daily. Should I be taking prenatal vitamins instead? Any suggestions would be appreciative.