When the second Meg is killed, it appeared to me that the Meg spit out a shark. Was that a baby Meg for the sequel should this one do well?
Despite some sharks bearing their pups inside them, the pup wouldn't survive all the damage and casually swim out of it's mother by her mouth. The birth and digestive canals are not related. Megalodon are also unknown regarding whether they bear pups or lay them.
This was likely just a shark that started eating the Meg from the inside and then came out. I found it a very eerie, but great, shot, of how ruthless the ocean and the shark's species are.