Trying To concieve problems! Help?

I know it's not the easy thing to do for a lot of people. Every month having sex every other day, waiting at least 30 mins after to clean up and let the little swimmers go, and then seeing the BFN after waiting a week for that missed period just to finally show up. Sometimes it gets to me and sometimes I suck it up and try again. Also I can't help but think what am I doing wrong or not doing??