You are very young. Are you sure you want a kid so early in life? Have you thought about your finances and your ability and maturity to take care of another living being?
If you are convinced that you want a kid immediately you can go for it. However there is no reason to be concerned. Getting
pregnant takes time. Give yourself atleast 6 months to one year before you undergo any tests unless you have a pre-existing medical condition.
Next Steps
Calculate your wifes ovulation date (calculator freely available on the web) and try to have intercourse on those days.
Health Tips
Before going for a child it is better if both the partners get themselves physically and mentally fit so as to avoid any complications during pregnancy. Also stay away from smoking (both partners).