what am I doing wrong

Erica
Hello lady's, so I have been with my partner for 6.5 years and of those 6.5 years I haven't been on birth control for 4 of them. We use no forms of prevention and we are both healthy. My partner has a child from a previous relationship and I have gone to the doctors asking them if something is wrong with me as to why I haven't gotten pregnant. The doctors wouldn't do any tests because they said I'm too young (26) and he is (34). they see no reasons for me to not be able to get pregnant. Has anyone else had issues with this similar to me? Or what has helped you get pregnant.