I had unprotected sex last Monday, July 14 and I took Nordette 12NN and another at 12MN. I had unprotected sex again today. My boyfriend did a withdrawal but I want to be sure because sometime he does pre ejaculation. Would it me okay and effective and take Nordette as a morning after pill? Would it have a bad effect if I take Nordette as a morning after pills alternative couple of times in a month?