He asks can he?

Is it weird that my SO asks if he can finish in me? We've been ttc actively since August. We've never used protection. He used to ask all the time until we started ttc. Now he's started randomly asking again within the last month or so. If he knows that's just what we do now why would be be asking?

I haven't asked him about it yet. He just did it again today and it throws me off.

Also I'm pregant 2 weeks. He's aware.