3rd baby but so nervous

me an my partner decided we would try for a baby next year after we got married, and that would be our last baby.. this came as a big surprise a happy but big surprise. but i am so nervous! ive been in my new job only 6 month how do i tell them? im still organising our wedding baby will be 2 month old stressing that baby will be too young and a wedding is hectic. thinking we need to start looking for a bigger house... anyone feel slightly nervous and felt this before.