Absolutely, always focus on the live ones and don't get hung up over the ones that didn't make it to the other side of their first feed.
Time enough after lambing is over to look back and reflect on whether any changes in system or husbandry could improve live births another time. Right now, you and the sheep need you fit, active, positive and confident!
But, they always say that with lambing, you get your problems at the beginning or the end, so hopefully it will pick up and get better soon!