As long as your adapter does not start to blink continuously, you don't need to worry.
On my MacBook Pro, the adapter is green when I plug it in, then orange, checking if the battery needs to be charged, then green, if it there is no need charging the battery.
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If your battery is charging or charging is on hold, the indicator light glows amber. If the indicator light on the MagSafe 3 connector flashes amber repeatedly, try these steps:
- Disconnect the USB-C to MagSafe 3 Cable from your Mac and from the power adapter.
- Disconnect the USB-C power adapter from the wall outlet.
- Use a dry cloth to wipe the MagSafe 3 port and MagSafe 3 connector. Make sure both the port and connector are dry and clear of any debris.
- Make sure the USB-C port on the power adapter and the USB-C connector are clear of any debris.
- Restart your Mac.
- Connect the USB-C power adapter to the wall outlet, connect the USB-C to MagSafe 3 Cable to the power adapter and to your Mac, then try charging again.
If the indicator light continues to flash repeatedly, contact Apple.
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copied from: If your MagSafe cable or power adapter isn't working - Apple Support