Pregnancy tips?!?!?!

My husband and I have been trying for 6 months now, it seems like it's never going to happen. My best friend just started trying and is pregnant already and many of my other friends are getting pregnant so easily that it's hard to not be depressed about it. Does anyone have some suggestions of how to get pregnant faster or up my chances? I have been taking vitamins, quit smoking and quit drinking, and have been drinking a lot of water and eating healthier. Please?!?! Anything would help!!