Just looking for some encouragement

Alrighty my SO and i had gotten pregnant the beg of July of 2014. Lost our daughter at almost 16 weeks. Have been trying since November 2014 with no luck! Based on my last cycle (on here) my most fertile days landed today at 27% tomorrow 33% and yesterday was high too. Well, no luck today in trying but yesterday morning yes. Tomorrow is probably a no go too. My question is who fell pregnanct only having sex one day out of the most fertile based on this app? Getting tired of trying to be honest and ive heard when you stop is when you get lucky. Im 25 hes 38 also.. anyone with similar stories who fell pregnant only doing it once at the beg of fertile days?