Will the 5:30 bus on Line 2 be enough for me to reach my 7:50 PVG Spring Airlines flight?

I will be flying from PVG to MAC on Spring Airlines over New Years, and the flight is at 7:50AM. The airline closes gates at 45 minutes prior, but I know these things can be unpredictable, so I need to get to PVG early! The subway stop closest to my hostel in Changning doesn't start until nearly 6AM, so I won't be able to make it using the subway. Will that 5:30 bus be enough you think? Or am I cutting it too close? What other options are there?