I don't think 5 days is to soon. I took a test tonight just 7 days after ovulation and its positive! This is the thing though the test you take 5 days before won't be reliable unless its positive probably. Like you could get a negative result and then get a positive a few days later. Some women don't get a positive preg test until they are late for their period. So if you test and get a negative result on 5 days before I still wouldn't drink cuz that could be a false positive!
if you are 5 days early you most likely will have a neg even if pg. ive had a pos with a few pgs early and with my last not till the day after i was due.
I think 5 days is too soon. Some HPT do claim early results, but I don't think I'd trust it until at least the first day of a missed period.