I’m having a hard time....

I’m trying and trying with my partner to get pregnant. But it’s just not working. We have sex 3-4 times a week and hope that my period is late. But nothing. I don’t know if there’s something wrong with me, or if there’s something wrong with him or what. Idk what’s going on and I’m scared that I won’t ever have one. We’ve been trying for a little over 5 months straight and not even a scare... I’ve gotten new pms symptoms that made me hopeful thinking that it meant something. But I’ve either started my period early or right on the dot when it’s supposed to... which literally never used to happen. Can I get some guidance or advice please?