It's probably still a bit flat, but no worries. I do 30 PSI for 48 hours then down to around 10-12 depending on how much carbonation I want. At normal fridge temps, 8-10 PSI gives you a lightly carbonated beer, (good for stouts, lots of english types of ale, etc.), 12-14 psi gives you fizzier beer, (good for APAs, creams, etc.).
This is highly simplified. Really just look up a carbonation chart and you can find out exactly what temp/PSI will give you a certain volume of CO2, but honestly 10-12 does me fine for nearly everything.
You can taste whenever you'd like. Sometimes I even pull samples at 30 psi to see how the carbonation is doing. A short shot doesn't seem to foam too much with 10' lines, even at 30 PSI.