Getting pregnant - HELP

Jenny • I'm 27, and I've been trying to conceive for about a year with no luck - YET! 😒😔💔
Well, the title is sort of self-explanatory. I'm 27 and I've legitimately tried to get pregnant with about 3 different guys (married to, engaged to, and now with my current boyfriend of 2 years). My question is HOW do I do it? I know it seems stupid, but I'm having no luck whatsoever. I tried just letting things flow, getting the ovulation kit thing, period trackers, having sex every 2 days just to be safe, everything. And it's just not working out for me. 
Does anyone have any tips, tricks, similar experiences? I'm at the point in my life where I'm seriously ready to start a family. Every period that passes just makes me that more discouraged. 😔 This is my first post; so thanks in advance for being nice! ❤️