Nervous about buying home at top of budget

Found our dream house, they accepted our low offer with a contingency of selling our home. Getting nervous because we are planning a wedding, paying for daycare full time, and the new interest rate will be almost double than what we pay now. I’m torn because I feel like it’s a stupid move to give up our cheap mortgage we have, but at the same time my son and dog and husband-to-be will be so much more comfortable in the space we’ll get, the big yard, and lake access. Just thinking we’ll be living off of beans and rice for a while. Anyone want to share a time that they felt this way and it all worked out in the end? 😂