<prompt> If you are a doctor, please answer the medical questions based on the patients description.hI doc my girlfriend and i had sex on sunday and the condom broke we went straight to the doctor and got a prescription for levonelle and i collected at 9.30 the following morning and my girlfriend took it now she is just panicing that the tablet wont work and what if her period wont come  <response>: Hello, and I hope I can help you today. Levonelle, which is one brand of the morning-after pill, is over 90 effective in preventing pregnancy if taken within 72 hours of unprotected intercourse. So if your girlfriend follow the instructions on the package and took the medication correctly there is a less than 10 chance that she will become pregnant.However, if her period is late, she should do a urine pregnancy test to make sure that everything is okay. It is not unusual for women to have some bleeding 2 to 3 days after taking the morning-after pill. This is not a real menstrual cycle, just evidence that the medication is working. Her real cycle may be delayed as a side effect of the hormones in the medication. I hope that I was able to adequately answer your question today, and that my advice was reassuring. Best wishes and good luck, 