troubleshooting

This is white widow at about 3 wks. I havent given any nutes, except a little N about a week ago. But the rate of growth is extremely slow (obviously).
Any helpful comments would be greatly appreciated...

Looks to me like a phosphorus lock out by the pinking around the edges and the necrosis on the leaves.

Most likely cause to me would be the PH of the soil locking this out.
Get a cheap ph tester and do a test on your soil.

Also at this stage I would recommend starting a new bean coz that one doesnt look good and might take longer to bounce back than starting fresh.