Pack n play instead of crib?

GF

We got a baby trend pack n play that can be used as a bassinet. So far it’s all we have for baby to sleep in but I was wondering if it was okay to continue use until he’s big enough for a crib? It has pretty thin padding and I don’t know if I should use something else to lay him on or if he will be okay sleeping in it as it is. Trying not to spend money on something we won’t need to use yet