Hi, I was on augmentin duo for 7 days. During that time I had my period and 7 pill free days. After the pill free days I started taking the contraceptive pill again as normal. However 4 days after finishing my course of antibiotics I had sex (a day after my period had finished)and did'nt take any extra precautions apart from the pill. I am very worried that the pill didn't work and would like to know asap if I should get the morning after pill.