Revegging due to light cycle change

[JC_GRiZ]

I am in week 4 of veg and just topped/fimmed my Bruce Banners. I had a malfunction with my light timer and it automatically switch from 18/6 to 12/12. This went on for about a week until I noticed it wasn’t on this morning when leaving for work. No pistils have shown yet but I can see a slight bit of that light green where the bud sites are located. Can I switch back to 18/6 after a week of 12/12 or will this stress the plants to herm?

Thank you in advance for your replies!