is there a ferry from Macau to Discovery bay ?

No direct ferry runs between these two places.
You can take the ferry to get to HK-Macau Ferry Terminal first. The schedules are from 07:00 to 23:59 with the frequency of 15 mins.
Then take bus no.307 at Wing Kut Street, Des Voeux Road Central, get off at Central Pier 3, Man Kwong Street. After that, take direct ferry to go to the destination. The ferries operate for 24 hours with the duration of 25 to 30 mins.