do i say this?

my boyfriend keeps asking me what i want for our two year anniversary next month. i dont want anything materialistic at all, all that comes to mind when he asks me is "i want you to make me your fiance!" i obviously wouldnt say it like that but he keeps asking and i just tell him i dont know. im pregnant with his baby and we've lived together basically our whole relationship so im ready to take it to the next level. next time he asks me what i want should i just say "well if you're ready i would really love for you to make me your fiance" or do i just keep quiet? he's not the type to pick up on hints and im afraid if i dont let him know that im ready that he wont ever figure out that its something that i want. what would you do? also, please no rude comments like "why would you do that? he'd ask you if he wanted to marry you" because i know he wants to be with me forever, i just dont think marriage is something that would cross his mind until he learns that its something i want and think about. plz comment