Fertility issues?

I am 28 and have been married 2 1/2 and have not used birth control since marriage. We have not been pregnant yet. My husband had gotten someone pregnant around the age of 17 so I think he is fine. However, I have a period every month and this month I took ovulation tests during my window for the first time and it was a darker than than the test line. Could there be fertility issues on my part and be ovulating every month?