Potato blight

Hi. Is it too early for blight? This is the first time I've grown potatoes and am doing so in bags. I know I planted too many per bag (3 instead of 1) but in the past few days I've noticed some of the leaves looking dry and crinkly. I pulled them off but having then done some internet searching am concerned it may be blight. I can post photos but I'm not sure how helpful they'd be given my earlier 'pruning'. Thanks