Brittany - At only 5dpo, from what I understand, it's pretty rare to get a positive. According to FF, most positives happen after 10 dpo. Technically speaking, it's possible you haven't even implanted yet.
Don't count yourself out yet. Try to enjoy your birthday and think about testing afterwards. Enjoy your birthday all you can; if you're positive...it'll be positive the next day. If you're not, that news can wait until after your birthday. You deserve a day of happiness.