trying to get pregnant

Hi ive been stressed for the last 5 months and still not getting pregnant. Me and my boyfriend wants a baby since we have a chance to be together again after 3 years. Im 23 years old, is it possible that the reason why its hard for me to get pregnant is because im skinny, im not a smoker and drinker. But i feel like im always stress because of the problems. Pls help!! We really want a baby asap!!