It may take upto an year to get
pregnant once you start trying. It has been only 3 months; so don't worry especially since you are young.
Next Steps
Go for a preconception check for both of you. If you want to have a fertility check also; see a fertility specialist.
Health Tips
Take Folic Acid and relax. Be positive. You will soon see the results!! Happy journey on your quest to parenthood!!