So I made a batch of Graff last Thursday and the OG was 1.062 and after pitching the yeast (I used a rehydrated Safale-05) there was little to no activity from the airlock or from the primary. I checked the SG again today and it was 1.061. Should I be worried about it not fermenting? The yeast was alive during the rehydration with bubbles and everything so I don't know what to think.