Hi!! First, congratulations!!!!! I am 25 weeks along with number 2 so have had to deal with this recently too! It is fine to wait until 12 weeks.....that is the 'normal' time for people to tell others they are expecting. Before you tell them you need to work out a very solid plan. If you plan to totally close then no real plan needed of course. If you are just planning to have a mat leave then you need to clearly outline for parents what you are planning, including plans for unexpected events! Don't forget to include the time off you will need for appointments. My mom is able to cover me on those days so that has worked out great for my families. I emailed parents on the Friday of week 13. I said I emailed instead of telling them in person to give them a chance to consider the news privately before we met to answer questions. I went in with the expectation of losing everybody so was totally surprised that everyone is staying to the bitter end, ha ha! Either way, you have plenty of time to prepare both yourself and your daycare families and work out what will be best!