Headache

Currency exchange is really hard to predict. I was planning to exchange some RMB currency this week, but the exchange rate keep rising now. I do not know should I wait the rate drop abit or exchange the money now. If I exchange the money now, what if it drop again next week? Then I would making lose in the exchange already! But if I do not exchange the money now, what if it keep rising? Then I have to spend money to exchange the money already! Headache ah!