Taking the emergency contraceptive pill, like Unwanted 72, is generally effective in preventing pregnancy when taken within the recommended time frame. However, it is not 100% foolproof and there is still a small chance of becoming pregnant despite taking the pill. If you are already 5 weeks pregnant, it's important to consult with a healthcare professional to discuss your options and address any concerns you may have. They will be able to provide you with accurate information about potential risks or abnormalities associated with taking the pill during early pregnancy. Ultimately, the decision of whether to continue with the pregnancy or explore other options should be made based on your personal circumstances and preferences, in consultation with medical professionals who can provide appropriate guidance and support.