Sex on first day of period (day 1)

So my boyfriend and I had unprotected sex a couple hours after my period had started. It was day 1 of my cycle and I ended up bleeding for 7 days which is my normal length. My period isn’t too irregular, I usually have it it between every 24 and 29 days. To summarize, I would like to know the odds of me getting pregnant I know “theres always a chance” but statistically what are my chances.