I was given some cans of Propper yeast starter, using it for the first time tonight. When I opened a can, it fizzed, even overflowed a small amount. Didn't think much about it and finished mixing the starter, including my one pack of Wyeast. Then I saw the date on the bottom of the can --- 1/15/2020! So what do you think...postpone brew day until next week, when I've been able to get new yeast?