Is it normal?

My husband and me are trying for a baby. I have been on bc for 6 years. We after 2 and a half years of marriage believe we are ready. We got off birth control back in January and I had my normal period on the pill at the end of the pack. After 4 months I still have yet to have a period. We are not pregnant we test once a week. I know it takes a minute for it to come back but 4 months. Is there something wrong with me and can I get pregnant if I can't have a normal period.