10 days ago I brewed my third batch of home brew. My previous batches turned out well and i wanted to try another extact kit It was an brewmaster bock extract kit and the OG was 1.068. The final gravity wa to be 1.018 in 10-14 days. I am at 1.028 after 10 days and no visible fermentation at 60 to 63 degrees in the air lock. Is fermentation done? Do I need to pitch more yeast to complete fermentation? Please help this noob trouble shoot the problem.