Glaucoma testing?

I am 29 y/o white female, I had an eye check up yesterday and because my family has a history of glaucoma I got tested for that too. I was told that the average person has a 15 point pressure test, mine was 21. I asked what the danger zone is and he said 22, 23. Should I be worried? At the very beginning of the appointment before my eye exam he asked if I've been getting head aches. I said no, but now that I think about it I do. It just never occured to me to say yes because I've had headaches since I was a teen so I've grown to just accept and ignore them. Is there anything else I need to look out for?