LIcE . what's safe to use during 12 weeks pregnant!???

Dania
Yesterday my aunt took my daughter out for a shopping day, my aunt brought my daughter back and said if I've seen my daughter scratching her head? I said no why? she then showed me that my daughter has lice !!?!!!!! how ??!! when??? did she get them from her school?? and if so why didn't the school notify me?? My question is what is safe to use on myself since i am about 12 weeks pregnant????