I just recently started a beer and I am kind of concerned about the fermentation or the lack there of this early. I got it fermenting about 5 days ago and for the first 36 hours it was bubbling and going great. About halfway through the second day though it stopped. I did not panic thought I took a hydro reading and let it continue to do its thing. However now that I have done that my hydo readings have been about the same for the last few days. Its at about 4% alc at about 1.02 specific gravity. What should I do?