urgent advice needed

He posters,
I am seeking urgent advice from anyone who feels informed enough (specifically about BNB) to provide any.
This story is ridiculous but please understand!
I am an inexperienced investor. Today I was mucking around on my commsec account with a mate and accidently bought 16,000 BNB shares at $1.24 (long story). I don't have $20,000, so clearly I have to sell them within T+3. I didn't realise the order had gone through until just now (6pm Thursday night).
Not sure what to do. I can scrape together up to $5,000 tomorrow. Tyring to work out what to do and where to get sleeping pills so I can sleep tonight.
Some general questions I have:

1. Is BNB likely to be up tomorrow, if not - how down could they be (worst case scenario)?
2. Regardless of tommorrow, should I hold off selling until monday or tuesday?

Sorry if this is a bit wishy washy - I am not really thinking straight a the moment.
Any help is much appreciated.