I'm Very Concern With The Possibility Of Being Exposed To

I'm very concern with the possibility of being exposed to HIV. I am a female who had sex with a man I know nothing about. Anyways to make a long story short the condom broke. He immediately withdrew. I didn't continue and left. I did go to the clinic and got the ECP and started npep 48 hours later. My concern is what is the possiblity of me being infected?