Emergency contraceptive pills are very safe to use. Side effects, if they occur at all, are usually short-term and mild. Nausea has been reported in about 18%, or 18 out of 100 women using levonorgestrel emergency contraception. Vomiting may also occur in about 4% of women.
Gambling is a good example of speculative risk. Gambling involves deliberate creation of risk in the expectation of making a gain. There is also the possibility of sustaining a loss. A person betting $500 on the outcome of the next weekend English Premier League Match faces both the possibility of loss and of gain and of no loss, no gain.
Risk can be seen as relating to the probability of uncertain future events. For example, according to factor analysis of information risk, risk is: the probable frequency and probable magnitude of future loss. In computer science this definition is used by The Open Group.