I need answers

I just wanna know why is it so hard to get pregnant. 😕 me and my lover been together for 3 years and we decided we wanted to go half on a baby since last year but nothing ever worked. We tried doing it constantly, but that ain’t work. We tried on my fertile days but that ain’t work. I just want answers and solutions.. have anyone experienced this? Is there any solutions? Please let me know . It sucks not having a little one 😔