Please weigh the babies daily.There is sure to be a runt or two with 6. You'll need to keep a close eye out to make sure they are getting enough milk. They need to gain 6-10 grams a day each.
I'm going going to get a scale tomorrow so I definitely will. Is it possible there could still be one left. She keeps going in and out of breathing really hard and panting... I swear I can still feel one in there... Should I be worried.
No need to worry. If there is a kitten left she will deliver it in good time. Her system has just worked exceedingly hard to birth 6 kittens, so the panting and breathing sometimes occur on and off for the first couple of days, along with after pains. As long as she is not distressed she is fine. Cats also appear lumpy after birthing, as their uterus is stretched out.
Please give her a dish of KMR a day to help with her calcium needs. It also helps with the panting and after pains.