Since you are young and hopefully healthy, trying for atleast 6 months if not an year is recommended. Having sex around 2-3 days a week is sufficient to conceive in absence of any major problems.
Next Steps
First and foremost is to not stress out yourself. If everything is fine, your wife should conceive in around 6 months.
Health Tips
For a detailed understanding of chances of conception, you may go through my article on Practo healthfeed titled "When will I conceive?". Wishing your dream of parenthood comes true.