2020 accord LX vibrating at cold start
 

Bought a pre-owned Honda Accord 2020 LX. On the third day at cold start car vibrated quite sensibly for 1-2 mins, then the vibration went away. I was carefully listening to the engine since then and while no more significant vibrations, I always sense slight before it smoothens out. There are still a couple months left on the car of the manufacturer warranty and the dealer gives me 12 months of engine/transmission. I have a couple days to decide whether I want to keep it and face the risk or return it. Any advice insight greatly appreciated.

Did the check engine light or D4 light start flashing?

At minimum, stop by a parts store and have them scan for codes (or scan yourself if you have a scanner) to see if the engine computer detected a problem. I'd probably take the car to the dealership to have them look at it as well.