Hello, I was wondering does codinex sometimes mess up the menstrual cycle? I m a bit worried as my period is just over a week late. I last had sex the day after my last period finished, not on the pill but used a condom..I took a pregnancy test a week ago and it was negative but I m still anxious. I was taking codinex about 2 weeks after my last period for a bad throat infection so I m wondering if maybe that has slowed down my cycle? Thanks for your help