A: Yes I think you can
A: Did it work for you that time?
A: 1 tablet is provided in the box.
A: This is a question you need to ask your doctor or pharmacist. If uncomfortable asking, you could call any pharmacy and ask about interactions between plan b and other meds you might be taking.
A: It is not guaranteed to work but has a better chance at working if taken immediately. If you miss a period after taking it, you still need to take a pregnancy test.
A: Yes, you can still get pregnant if there was contact with seminal fluid, which can happen even if he pulls out.
A: You can go to the pharmacy counter and ask for a consult with the pharmacist to get advice on timing questions like this. Free anonymous advice about any over the counter drugs they sell from someone who has years of training. (Much more reliable than answers from random people on the internet.)
A: No, the FDA approved it for anyone of reproductive age, so they will not card you.
A: You can buy it at any age
A: Yes. It's available in the medicine shelves open to anyone to buy. It's not a drug you have to ask the pharmacist for or need insurance.