We literally saw Kurt in one of stories muttering something along the lines of “I’m not ready” to Sarah wanting another kid. Not to mention with his decline in health and everything else going on, if they choose to have another kid, it’s responsibility is most likely going to fall under him, as well as Fox. And he still seems so rundown from their house renovation. Sometimes it makes me feel sorry for him despite all the problematic things he has done.At first before the wedding I thought that she must be pregnant, but the more I see her rumble on about not being pregnant and not being the right time cause whatever projects and stuff, the more I think that she really wants to be pregnant right now, but Kurt does not want to atm.
So Sarah said that she wants a honeymoon baby. This was her and what she wanted. Not what Kurt wanted. So she's talking about it as much as she can to pressure Kurt to start trying and the whole "we have so many projects atm" bs is just her convincing herself that its fine that Kurt doesn't want to try straight after the wedding and because she is so jealous of Kate underneath. Thats why she is so all over the place with the all "don't ask me if I'm pregnant" bs. She is really upset because of Kurt, his wishes and not being pregnant, not because of all the questions.
ETA: even if it’s Kurt’s unwillingness of having a kid making her upset, she shouldn’t take it out on her loyal followers who just wants to know what is going on. A simple “not pregnant” would do, no need to be bitchy like she has been.