Is this just a phase?

Recently I have had a low sex drive. I love my partner to bits and I am not even finding anyone else attractive, but recently I kinda don't want to get intimate with my him. We have tried and I honestly don't even get turned on. I feel like our sex life is boring tbh. We are trying for a baby and everything was going so well but he says he's too tired after work which I understandable, but he expects sex same place same time (near enough) and he doesn't want to do anything exciting. I'm not sure if it's a phase we are going through or what but I'm scared to talk to him as he is quite sensitive and I don't want him to think I'm breaking up with him cuz I don't want that as I do love him.