If you didn't feel anything, and since it is Oxyflux, I'd bump it to 4, then 5 or 6 depending, add 1 a day after that, you may have to go to 10 or 11 like I do for Oxyflux. Remember, normal dose for guys is about 7 tabs, and Oxyflux is weak.
In the future you can ramp up very quickly (2-3 days), no need to go slowly as long as you know what works for you (including the brand/batch you're taking)