mixed signals

my boyfriend and I have been talking about having children for about a year now but, lately I can't tell if he's excited or not about the idea of getting pregnant. he seems to want to have sex more often than when I was on birth control which makes me feel like he's on board. but whenever we've talked about the fact that I'm not on birth control he seems nervous. am I just over reading the situation or is he not as ready as he seemed or said. I'm 33 so I'm not getting any younger but I also don't want him to feel like we have to have a child right now. he's also the one that always talks about wanting 3 kids and what we're going to name them. I feel like I'm getting mixed signals. should I be worried moving forward? or maybe even put it on hold? I feel super emotional after stopping birth control to anyone else have that issue?