How and at what stage of pregnancy did you tell your DC that you were expecting? How old were your DC? Did it go smoothly?
Also, would it make a difference if it was the first child of a new relationship and DC were from previous relationships?
OH and I have DC aged 7 and under and teens. I'm 7 weeks pregnant. We have an early scan booked for 9 weeks (we will wait until after that at least) due to a previous mc. For extra info, we are getting married when I will hopefully be just over 13 weeks (awful timing...) and haven't decided if we will announce the pregnancy before then. I don't completely trust the younger ones not to blurt it out on an exciting day. Eldest also has a big mouth after a drink. 
I'm almost definitely overthinking it, but I had a bit of an nauseous episode in a food hall today (too many god awful smells) and had to send my teen in - I felt caught out but I don't know if she suspected.