I have been trying to get pregnant for around 4 months and nothing please help

Concieving a child is one of the most difficult things to do when one is "trying" Because you are trying, the sex is less enjoyable, more of a "job", you can't relax, your constantly stressing over the possibility that it won't happen.
Trust me, 4 months is not very long to be trying to concieve.
Before this were you using any form of birth control? Some forms actually don't completely work out of your system for up to a year, the Depo being the main one.
Don't be stressed over 4 months. Try very hard not to think of producing babies when being intimate.
The more you can relax your mind, and your body, and stop trying to concieve, the better chance you will have.
Good luck. :)