Since last night I've been taking Tylenol for a very sore throat. Since I woke up today I was taking two every 6 hours as the label said, and I was supposed to take my third dose of the day (last one before I go to bed) about half an hour ago, but I can't remember whether I took it or not. Is it safe for me to take two now just in case I didn't? I'm worried about hurting my body but I also know if it turns out I didn't take them I won't be able to sleep...