system
A chat on subreddit /r/wallstreetbets
human
You bought calls that you didn’t close and they expired ITM? You will be long 100 share of SPY, which it seems like you didn’t have enough cash to buy. RH will probably liquidate those 100 new SPY shares at open on Tuesday. You might lose a little bit or gain a little bit depending on how much SPY moves between now and then, but largely it seems like you’ll be fine, as long as my interpretation of what occurred off the limited info you have is correct.
gpt
people need to understand this more.... 

For the person buying, if their 390C today cost them $12, the buyer and seller's theoretical breakeven is 402... but for MM/Broker, as long as it is at least 390, they will exercise it. Easy to think it's just "bets", but they are providing liquidity, so there is always real stock and real money needed to actually cover the contracts. There might be an option for you to turn it off... but unless you asked first, assume that it will be triggered. 

This also means you could be profitable or you could be more red by Tuesday... 

If SPY goes beyond 410, OP makes money because of this, if SPY drills to 395, then OP loses even more money.

In one mistake I made I ended up getting my long put exercised (turned into short SPY), and ended the losing trade to +700. Since then I always close when it is not my intention to prolong the battle.

For no drama settlement/letting expire, go with SPX/NDX.