Girls, can you tell me? We're on GVB, after childbirth it's been two m…

Girls, can you tell me? We're on GVB, after childbirth it's been two months and we got our period ?‍♀️ I'm breastfeeding one breast, but there's no milk in the second at all, my little one is eating only from one breast, but it's true that there's less milk during periods?