I had unprotected sex on the 30th of june and the condom broke. My husband ejaculated in me. My period is due on the 11th of July and within 48 hours of unprotected sex I took an emergency contraception (combined pills) and got my period 6 days after that. However, my period only lasted for 3 days when it usually last for a 5 days ( heavier to lighter flow). What is happening?