Not sure how to feel

We weren't specifically trying to get pregnant. We already have two healthy happy kids and another kid is an expense we weren't prepared for. We agree that we will definitely love that child and that we want a third but the stress of having it right now is making it hard to be so excited. I know so many of you try so hard to get pregnant and I was like that with the first two. I'm just not sure how to feel this time around.