I started my first brew yesterday and am making a Porter. I rehydrated my yeast but made the mistake of stirring it into the water immediately instead of letting it sit in top of the water. It also sat for a bit more than 30 minutes before I pitched it (closer to an hour I'd say). About 24 hours later and it looks as if nothing is happening at all. The wort looks exactly the same as when I put it in storage. Should I wait longer, or start thinking about finding more yeast to try again?