Hi and welcome back to the forums!
Before allowing your budgies to breed, there are a few aspects you need to consider. By looking at your posting history, you don't yet seem to have the required experience nor a good, solid knowledge on the species in order to safely breed your budgies and at this point it would be best to remove the nest box and discourage breeding: https://talkbudgies.com/budgie-breedi...want-eggs.html
The decision to breed comes with a whole lot of responsibility and commitment, the lives of the breeding pair(s) and the chicks are depending on you and the response you give if/when faced with adversity.
Things like being able to tell if your breeding pair is in good health and top physical condition to go through breeding; when a hen is expecting an egg or if she is showing the first signs of being egg bound; when a chick is having developmental problems, not being fed or showing signs of dehydration;
when there is aggression, abandonment and neglect of the chicks and it's solely up to you to feed and raise the chicks. The ability to detect early on and solve these issues can truly make a difference on the outcome of your breeding journey.
Please read these links: https://talkbudgies.com/budgie-breedi...s-new-old.html
If it's your wish to breed your budgies, you can do so later on, when you are fully prepared and this is done by studying the species day by day, to watch your budgies behaviours and truly get to know the species through the daily interactions you have with them.
The wealth of information found on the several articles and stickies will be very useful in terms of ensuring your budgies have the very best care and diet in order to be in top physical health to be put to breeding in the future.