It depends when you got the third dose. Some of the people vaccinated in July or August got a full 100 mcg dose. Later they switched to the 50 mcg dose that is being researched by Moderna. I have a friend who started out in the Moderna vaccine trial last year. She switched to the Moderna booster this Summer. She got the 50 mcg dose which is 50% of the original Moderna 1st and 2nd doses. Supposedly they will test a 4th dose sometime. The thing is the bias in the research was to build immunity quickly to fight the pandemic and demonstrate safety. It's highly unlikely that the doses would be spaced so close together in a childhood vaccination series. The British demonstrated that a longer spacing between doses builds stronger and longer lasting immunity. Of course they did it to stretch out their vaccine supply and get more first shots into arms. That paid off against the original variants circulating in the UK last Winter and early Spring. It wouldn't work against the Delta variety.
This was on October 30. She said the doses were 100 percent at that time.