One day I masterbated in the bathroom but during ejaculation by mistake a small amount of sperm fall on my sister's underwear which was kept on the bathroom's floor after this I washed my sister's underwear 5 times by the help of soap, detergents , sanitizer and liquid dettol and then spread underwear outside on a wire for drying after 14 hours when the underwear becomes fully dry she wear the underwear the next day. Can she become pregnant by this act???