Men who can't speak up

So I have an issue this may be kinda long ... my husband has verbally stated from the very beginning that he does not want children, I have 3 from before our marriage so it worked out, not that I wouldn't LOVE to have his child it's just I made a conscious decision to respect his wishes! So we have Glow to keep track of things ... here's where it gets tricky.

Arguments occur when BC is brought up he says it'll change my moods, hysterectomy- out of the question it costs too much, I'll lose my sex drive blah blah, the shot I can't have bc of health issues. He is been rude on days I remind him it's not a good idea & was almost shocked I stated my period. How do I get him to open up to me, I'd like to know if he wants a baby & why he is behaving this way!!! But I don't want to approach him in a disrespectful way or look excited or upset ... I'm so frustrated men are so weird!!