Thank you spinningirl10. Alas, being hungover probably wouldn't work as like I said, I very rarely drink.
Thanks JessieMcJessie. PILs will not be entirely supportive I fear. we are close enough but they are of the opinion that the two DC we have now are more than enough, particularly as we have one of each. They weren't particularly enthusiastic when we announced the news about DC2 tbh so am sure this will go down like a lead balloon if I'm honest.
The plan is to tell the children first anyway as after my husband they have the most right to know. Hopefully, I will be able to tell them after my first scan and can then show pils the picture.