<s>[INST] Hi, my girlfriend and I had sex last night and my condom accidentally slipped off. I ejaculated in the condom, but I may have ejaculated in her too. To be safe, I bought Nordette and she took it about an hour after sex, she will take it again in 12 hours. How effective is Nordette as an ECP? [/INST] Hello, and I hope I can help you today. All combination birth control pills can be used as emergency contraception.  However, the dose of one Corvette pill is not high enough to work alone as emergency contraception. There needs to be a total of at least 100 micrograms of estrogen in each dose 12 hours apart for emergency contraception dose.  This means that your girlfriend needs to take THREE Corvette pills (that gives a total of 90 micrograms-which should be enough) in 2 doses 12 hours apart to work as EC. So I recommend, since it still has been under 72 hours since your condom accident, that she take three pills for her next dose, and the 3 pills 12 hours after that.  She may experience nausea as a side effect of the pills, which is normal, and she may bleed 3-7 days later, which is also a side effect of emergency contraception. If she uses this regimen, emergency contraception has a 90 percent success rate to prevent pregnancy. I hope I was able to adequately answer your question today and that that my advice was helpful. Best wishes, </s>