As a serial, addict POAS-aholic... I know that 24 hours doesn't make much difference on HPTs. You need at LEAST 48 hours, so if you do one tomorrow morning, it should be darker than yesterday mornings one. I get all stressed out when they don't get darker after a day... But then breathe a sigh of relief when the day afters is darker! Can't WAIT to hear the BT results tomorrow!!!