Background: I am a PhD student. I intend to attend a scientific conference in the US in August, where I'll be presenting a paper. I specified B-2 type (tourism, pleasure, visit type) while filling my DS-160 application form and scheduling an appointment with the US Embassy in Madrid. I later realized that B-1 (business type) fits better for scientific conferences, but I had already submitted the DS-160 form with B-2 specified on it before realizing. I have also received an appointment confirmation.
Question: Do you think specifying B-2 instead of B-1 might be a problem during the visa interview please? What can I do to avoid potential problems please? Thanks a lot!