i'm brewing my first batch of home brew with a coopers micro brew kit its a lager i did everything it said its been in the fermenter almost 5 days now and the airlock was bublling pretty steady every 2-3 seconds for about three days and then just stopped and it had they call it krausen at the top but only about a half inch or so thats all gone down and the bubbling has stopped completly should i take a hydrometer test at this point cause the directions say to leave it in a week then bottle i'm worrided than it didn't ferment all the way plus theres like a sweet smell kind of like sweet apple coming from airlock is this bad i sanitized everything very good i'm wondering what all this means and what should i do at this point anyone that could help i would really be gratefull thanks in advance eps