Shouldn't be a problem. My girl had it too.Vet told me when she was a pup it wouldn't be a problem and it wasn't. Whelped 9 naturally in her first litter, had to have a c-section in her second and the vet removed it then.
In my experience, it is usually the cause of a harder delivery and a bigger, heavier puppy. I have very rarely had them in Labradors, but they are much more common in other breeds.
I've never had one with a c-section delivery, only with natural harder deliveries. If it is a "reduceable" hernia, it can be fixed whenever. If not, it should be fixed before 6 months.