Why does he keep asking about birth control?

I take the pill consistently everyday. However, my partner has made comments in the past about he would have children with me etc and when he saw a celebrity on tv he commented on the benefits of pregnancy. Anyway, he hasn't mentioned it in a while and he knows I am on birth control. A few weeks ago he asked if I was still taking birth control after having unprotected sex with me.

When I have had cravings etc in the past, he would say its a sign. He has even asked if I am pregnant in the past. Last night he commented on how my boobs are heavier and this morning again asked if I am still taking birth control? Surely you would want to ask before having sex? Why does he keep asking me?
Why does he keep asking about birth control?
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