Advice

So I'm 31 and I've got the baby fever and I've got it BAD. I talked to my boyfriend about my desire to have his child and he agreed that we should get off BC. Well now we've gone from having sex every day/every other day to having sex 2-4 times a MONTH. When he climaxes he says things like "I'm gonna get you pregnant" etc etc and always asks me all month long "are you pregnant? Have you checked?" I know the decrease in sex is because he's got a lot of stress going on and is unhappy with his recent weight gain but when I try to engage in sex or start foreplay he turns me away. How can I explain to him my wants and desires without coming off as a baby crazy woman? How can i explain my need for more sex, not just so we can conceive but just for me, without making him feel more stressed?