Usually, the reverse happens. A President starts out with all kinds of good will and over time, his approval rating starts to drop. Trump started out quite low at only 45%, but after his first week, it has ballooned to 59%. Must be doing something right.
http://www.thegatewaypundit.com/2017/01/big-league-rasmussen-poll-says-trumps-approval-rating-59/
http://www.thegatewaypundit.com/2017/01/big-league-rasmussen-poll-says-trumps-approval-rating-59/