Worried about weight gain

I wanted to hear some mommas opinions. I'm very worried that my baby girl is not gaining enough weight. She will be 7 weeks old tomorrow and when we weighed her at home she was only 11lbs. At her 5 week check up she was 10lbs and 8oz. If the scale is right, she would have only gained 8oz - so 4 oz a week. Now, we had trouble at first with breastmilk and me producing enough and have been seeing a lactation consultant. At her 5 week check she gained 10 ounces in a week! We were so happy and the lactation consultant was confident that she is getting enough. Now, I don't know. She has a good output of pee diapers and poo diapers, since it spaces out by 1 month. I will bring her in for an appointment on Monday. But, how do I survive the weekend with the constant worry that she's starving/dehydrated. 

When I feed her she pulls off the breast and then relatches. It's a constant game of this.. Then finally, when I think she's full is when she won't take the breast anymore. I don't know what I'm doing wrong. 😔