So if the exchange price for BTC does not drop by the same amount of the exchange price for B2X, a fork essentially means money (dollars) is generated out of no

So if the exchange price for BTC does not drop by the same amount of the exchange price for B2X, a fork essentially means money (dollars) is generated out of nothing and given to me as the owner of now 2 coins (one of each type)? Or in the opposite case, a fork could mean I lose money, just because somebody else decided to create fork?