The card that represents the mental aspect is the Five of Cups reversed. This card represents feelings of bewilderment and confusion, which can be due to a sudden change or the loss of something important. In the case of the question, this card indicates that one feels lost and helpless in the face of the uncertainty of the situation, but at the same time it can indicate that one must face the challenge with courage.
The Page of Wands represents the bodily aspect: this card indicates that one must be ready to welcome opportunities without fear. The Page of Wands also suggests that you consider all aspects before taking any action. Thus, the card suggests that you are ready to welcome good luck with confidence and joy.
The last card in the reading is the reversed King of Wands, representing the spiritual aspect. The reversed King of Wands may mean that you need to remember that you can't always control what happens, only how you deal with it. The card therefore suggests being aware of one's role in the situation and using one's wisdom to deal with difficulties.
In summary, the three reading cards suggest that finding the gold coin could be a sign of good luck, but one must be prepared to welcome it with confidence and courage. So, yes, we think finding the gold coin is a sign of good luck!