In recent time electoral polls have failed in their predictions. Specially in Spain-Europe.
I remember in 2016, until the last minute, the victory of the Brexit was almost unbelievable and it happened.
Here in Spain, in 2016 the Popular party got more representation that all the polls said. The candidate Mariano Rajoy is the prime minister of Spain now: the electoral result was quite different than polls said.
Now, at April 2018 the polls in Spain, say that a quite new party, Ciudadanos, will win the next elections. We’ll see what happens in May 2019, but i think that the population of a country at the moment to vote, consider seriously which party managed best the country and the new parties get lower results than expected.
So in this scenario, the approval of Donald Trump, as the 45th. president of US, despite polls say is low, where it will be really showed are the official elections. So there’s no reason to worry about it.
To avoid reading fake news, I recommend you take a look at the official White House website.