Trying to get pregnant

Janneli
Hi! I just turned 24 years old & my boyfriend and I have been trying to get pregnant. We've been having unprotected sex for about 5 months now & I just can't seem to get pregnant. I know he's not the problem because he has a son of his own. How do I find out if I'm the problem? I don't even know where to start. Can anyone help?!