Stress

I've been trying to get pregnant for 5 months now. I'm young and I feel like I should be very fertile. I know I should give it a year but I think about it every day even when I try not to stress. I want to do it naturally and not be stressed out because I know that it affects  fertility. I enjoy the sex that me and my partner have and he has another child with someone he used to be with so I know it's not him. We've both been trying to figure out what to do. Does anyone know any vitamins or foods or any ways that could increase my chances of conceiving? I feel hopeless