Sorry, but once a garbage bag is full of tildes, it's no longer unused. Therefore, it's not worth even close to ten sammiches and your chances of pregnancy are virtually nil.
Maybe. If a female crawls out of the garbage bag in the middle of the night while you're asleep she'll try to crawl into your mouth so she can lay her eggs in your stomach. You'll be pregnant with tildes. The female tilde can lay up to several thousand eggs.