This will always happen if you don't have a daily, weekly or monthly limit of what amount you should gamble with. If you have a limit and you haven't exceed the limit, then you have nothing to worry about even if you lose the first bet.
This doesn't have anything to do with limits; even if you still have enough funds to gamble based on the budget you have for the day, there is the type of losing that some will lose, especially for sports bettors, that will make them have a rethink about their next bet. Even if they have marked it all out, they will have some doubt either to play or change the game since the last one was a failure.