Hi and thanks for using the forum.
It is possible for you to be fertile and still have some trouble conceiving. It could be that your partner may have some issues. IF you are having trouble conceiving, you both should get checked out to be sure that everything is in "working order". If you both check out healthy and you are still having trouble, there are other options. You could try IUI (intrauterine insemination) or even IVF.
I suggest that if you are having trouble, you should see a reproductive specialist to help you figure out what your options are . I hope this helps.
Good luck.
Bridget