Baby exposed to lead ?

At my sons 10 month appointment they had to prick his finger to test for lead and his level came up at a 7. We had to go back to the hospital yesterday to draw blood from the vein and now were waiting on his results. I'm honestly freaking out. I was told by his pediatrician I could give him the filtered water from the fridge but have switched to nursery water because I'm just so worried it's from something that I caused. Has anybody been through this. Is my baby going to be okay. I honestly hate myself rn tbh.