The first test I was positive on was last monday, March 5th. I didnt believe it so I asked for a second. Same result. Then I bought a take home test on the way home with the same result. I've seen all the common things that may cause a false positive, but nothing crosses with anything I take. I have taken ranitidine for excess stomach acid, regular tylenol, oxycodone(with a prescription). Thats all the medicines I have taken. I dont drink regularly, but had several Vodka and tonics 2 days ago. I stopped drinknin coffee last week to see if that was the culprit, but I came up positive again tonight. I drink a lot of sprite also. Any ideas?