Not only will your scored stay, but you'll still be able to keep playing that tournament at the pro level until the end of the month, even if you do make it to master before then.
Well done on the 63 as well. One issue you may well come across though, is that if you buy Master level clubs, you will not be able to use those clubs in any tournament that you entered at Pro level. Should you want to play those tournaments at Pro level, you'll need to change your clubs so that you have elligible clubs for playing at that level.