Is there any way to get 2 dragon eggs on bedrock, without cheating or dupes?
Solution 1:
It appears your world has had some sort of glitch, as a second egg spawning after the Dragon's death is impossible. According to the Minecraft Wiki,
The dragon egg is a decorative block or a "trophy item", and is the rarest item obtainable in the game, as it generates once and once only.
Or, your friends may have duped the dragon egg and placed one for you. This is most likely the occurrence, as the egg you found from the "previous fight" simply doesn't generate in that fashion, and your friends did in fact just place an extra fake egg on the podium for you.