Annoyed

Me and my boyfriend have been trying to get pregnant for 5 months now. My periods come every other month so it's been really hard. I'm young and I should be fertile but I know I should wait at least a year. I know it's not him because he has another child with someone else (his ex). I haven't taken a pregnancy test since March because everything is negative. I try not to think about it but it's hard when both of my managers and some of my coworkers are pregnant then others come in with their kids. I've been starting to take vitamins in hope of helping me conceive because I've seen that it helps some others. We have a lot of enjoyable sex but I never feel symptoms or any different so I decided not to take any tests unless I do. Any advice? :(