Chance of pregnancy?

I started birth control (pill) the first day of my last period which was 8/29. Period ended 9/3 . I had sex with no condoms on 9/4 and 9/6 again . On 9/4 I did take a plan B but didn’t not take one on 9/6. He also didn’t finish inside me but there was precum . What are my chances of being pregnant ???