My fiancé works at a dairy , and I go with him because he works overnight . I'm just wondering if it…

My fiancé works at a dairy , and I go with him because he works overnight . I'm just wondering if it is safe to be around cows & their feces ..my mom and grandma keep saying it's dangerous but why ? I'm 7 weeks 4 days. Wondering if any mommies were around cows during pregnancy and everything was fine