You didn't say how long you left the first one in fermenting. If you are doing an American Amber right now, you are probably using either US-05, or WLP001, or WYeast 1056 (all the same great yeast). Leave it alone in the primary for 2 full weeks. You should be able to take a gravity reading the night before you plan to bottle/secondary and another one the next day. Both should be in the 1.008-1.013 range, and they should read the same value 2 days in a row. If it is lower, then don't worry about that, but if it is much higher than that, wait a few more days and measure again. When you get 2 days in a row with no changes, then you should be safe to prime and bottle with no risk of bottle grenades.
If you get a weird ass reading like 1.022 for 2 days in a row, then rouse the yeast and see if that helps knock it down.
HTH-