I agree with Amikety - it's your responsibility to get all the papers together, and unless you have a good reason to send it now, then you should wait.
A good reason could be: having to get several police certificates from different countries, and since they expire after 3 months, then you have a good reason. I did that for mine ( I had to send 6 different certificates...), and once I got to 4, I could not wait to send otherwise the first ones would expire by the time I got the last one. So I sent my file, explaining my reasoning, and it was accepted. but if you have only one certificate, I wouldn't do it.
Good luck,
Sweden