Eating Bread After Mezonot

If one was debating to eat either mezonot bread or hamotzi bread and decides to eat mezonot bread and says a bracha, then while eating mezonot bread he decides he wants hamotzi bread now, is it considered a bracha levatala on what he said on mezonot because he could’ve covered it with hamotzi from the start?

No, at the time the bracha was correct.