Even if you did a quick format on an SSD and you used it for 3-4 weeks after installation there is still a lot of residual data left unless you was doing extreme activities like filling the drive up to 90% by downloading large files over bittorent or some other data hungry activity that would definitely overwrite the data.
If that is not the case its wise to check for this residual data and analyze whatever is left of it.
Not by means of recovery software but by reading the drive bit by bit.