Hi Brenda
I wouldn't worry about using some of your weeklies at all!! That's what they are for, besides the best day to have a wee treat is on WI day, you've got a whole week to compensate!
P.S you can just right click and copy a silver 7 from someone else's signature then go into "edit signiture" and paste it in, it's dead simple. Definately get it on, you deserve it girl!! x