Bleeding Before Emergency Contraceptives

Er
Ok! So I had unprotected sex with my boyfriend 48 hrs ago in which
 we used the withdrawal method. I began to worry about my chances of pregnancy and scheduled a doctors appointment for emergency contraceptives and an std test for two pm  today. Just before I got in the shower low and behold, blood. I believe it is the start of my period. Am I still at risk of pregnancy?