Nervous... Advice???

I am 30 weeks and yesterday my boyfriend and i went to an indoor shooting range. He loaded the ammo for me then after 15 minutes i sat out by the window watching. Then i went back in for about 10 minutes so i wasn't in very long. I didn't like being in there because the baby's ears but after i looked it up and it said her ears are fine because they are fully developed but lead poisoning is an issue. Now I'm freaked out that my baby could be born abnormal. Did any one else go shooting while pregnant??