Hi all this is my first batch of a coopers pale ale kit. The wort finished fermenting and it's now bottled and has been for nearly two weeks. It's bottled in the FEP plastic bottles that came with the kit. The kit also came with carbonation drops which were 1 drop for 375ml bottles and two drops for 750ml. The bottles supplied were 550 ml bottles so I put just one drop in. My question is can you tell if the ale is flat by looking at it in the bottle or does it not bubble until it's opened?