what are we doing wrong ?!😭

My boyfriend and I have decided to Start trying for a baby about 6 months ago. We have done everything! Ovulation kits,apps, putting My legs up after we have sex.. EVERYTHING and I just knew this was our month.. I was 4 days late and I just knew I was pregnant but nope I started my period.. I just don't know what to do anymore.. Please positive words.. Thank you for reading my little rant..