I will make this short and sweet. I was told I couldn't conceive. I tried fertility drugs with no luck and 2 years of upset and constant trying . I gave up it was so awful. There were no physical reasons why I wasn't ovulating. Sometimes I was. Who knew. Finally I gave up. I started working out. I lost 40 lbs. I started enjoying sex again because I wasn't concerned that there was an outcome. 10 months later, I was 6 weeks pregnant and didnt even know it. I have had 3 children, all conceived naturally.
Just relax. It will happen. Concentrate on getting healthy and maybe losing or gaining weight if you need to do either. (this has been proven to kick in a women's hormones) you will feel better and more sexual. If this is not an issue for you, just relax and enjoy being a couple for a bit. It will happen when you forget about it!!!!!! My mother always said that and I ignored her.
Good luck! Quit stressing, kids change everything and it will happen in time. I suggest doing things you wont be able to do when they come, like bathing alone, trips, sleeping in sometimes and going out to movies!