...not sure what's up with him

My SO and I have a healthy sexual relationship. Most days of the week we are intimate. We don't believe in contraception but he does pull out because he likes it on my ass/tits/face etc.

We are working on baby #5 last night (wink-wink) but out of nowhere he pulls out and finished on my stomach/outer labia. I'm upset because it's was my fertile window, temp spiked and my CM is egg white [AKA - perfect timing].

I didn't want to make a scene so I have not said anything but this bothered me. I plan on talking with him about this soon but don't know what to say...