Hi I Had Sex With My Partner The 12th February

Hi I had sex with my partner the 12th February the first day of my last period was the 2nd February however I had started to take microgynon pill after my period had finished so when we had sex I was not protected therefore I went to the pharmacist on the 13th February as soon as it opened and I took the Ellaone pill It is now the 4th March and my period still hasn't come could I be pregnant