Few things... I did a quick google search on “blue widow hermi†and found many others experiencing the late blooming hermi on this strain. My guess is that it is genetically prone to this feature. That being said, all the seeds you have will probably be prone to hermi too.
Probability would be high that they are feminized, but I wouldn’t grow out another hermi. Not worth the effort. My 2 cents.
Also, it is worth noting that Feminized seeds are bred specifically to grow seeds that are female... the breeding program is what ensures this. Since you accidentally bred these seeds, you should ask yourself... is there is a chance they may have been pollinated by a neighbor’s plant, or maybe pollen clung to shoes/clothes? I would think that they were pollinated by the hermi feature...making them gem. But... do you have the time, space, $, and everything else needed to complete a grow to find this out?
If you do, you are doing better than I am.
Lastly, the seeds will be unstable...meaning hidden traits may come out and they may end up much different then the parents strain.
Start with good genetics, don’t waste your time and $. IMHO.