Girls, help! Please, my son brought lice from kindergarten. We went to our…

Girls, help! Please, my son brought lice from kindergarten. We went to our neighbor, she recently had a daughter who treated it with Pediculicin and spray. We're happy, we washed up and went home. Grandma said that she needs it too, we went to the pharmacy and bought a new bottle, read the instructions, but there is a contraindication for pregnancy, turns out! I'm 15 weeks pregnant, what should I do? Anyone encountered this ? Help me please! Should I go to the doctor tomorrow?