You can stop taking Nordette any time if you decide you want to start trying for a baby. If you’re trying to become pregnant, it’s recommended that you wait for a month after coming off the pill for your natural cycle to start again (a new period) before actively trying to conceive.
If you want to remain protected against pregnancy after finishing Nordette, you’ll need to use another contraceptive. You should speak with your prescribing clinician if you’re thinking of swapping your contraceptive pill.