WHy do you feel you need to repitch? Because you didn't sanitize your cup??????
Have you taken a hydrometer reading yet???? That's the only way you know if your yeast is working or not....and what leads you to believe it's not? Yeast's these days don't not take off unless they were pitched in boiling wort..the reason you see so many threads about stuck fermentation is not really that the yeast was bad, it's because the brewer went by something other than hydrometer readings as some sort of fermentation gauge (meaning their airlock isn't bubbling
which means noting really and shouldn't be used as a gauge), and they are nervous noobs....
Fermentation is not always "dynamic," just because you don't SEE anything happenning, doesn't mean that anything's wrong, and also doesn't mean that the yeast are still not working dilligantly away, doing what they've been doing for over 4,000 years....
You can't know if your fermentation is "stuck" unless you take a gravity reading.
Airlock bubbling, lack of airlock bubbling, stopped airlock bubbling
really is not an indicator of what is happening to your beer. It is NOT a fermentation gauge, it is a valve to release excess pressure, excess CO2...NOT AN ACCURATE INSTRUMENT....
So, get out of the idea of using "airlock bubbling" as a sign of fermentation, you have to realize that airlock activity is not an accurate indication of fermentation...an airlock is a vent for excess co2, nothing more...and half of my beers never bubble.
Read this for why arilock analysing is useless, and what is the only gauge of ferementation...
https://www.homebrewtalk.com/1217925-post3.html
And there is a link to my blog in there as well....The only way to truly know what is going on in your fermenter is with
your hydrometer. Like I said here in my blog, which I encourage you to read,
Think evaluation before action you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right
diagnostic tools before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in.....
If you don't have a hydrometer, get one..But don't try to fix something unless first you actually
know it's broken......
So why do you think you need to re-pitch???????