How do I check if a table exists in sqlite3 c++ API?

I'm opening a database file and potentially creating it if it doesn't exist.

But for some reason, this doesn't create the table. Any ideas?

const char* sql = "CREATE TABLE IF NOT EXISTS blocks(id text primary_key,length numeric)";

sqlite3_stmt *stmt;
rc = sqlite3_prepare_v2(db_, create_table_sql, -1, &stmt, NULL);
rc = sqlite3_step(stmt);

I haven't got it in here by yes I'm checking the return code at each point. There are no errors.

Perhaps there is a better way to accomplish this?