that sucks. It’s probably the cloudy weather couple with early season causing this. Hope for full sun for a while. Strain to strain you’ll have different trigger times, some very close to 12 hours darkness, some will only need 10 hours of darkness to flower.
You’re gonna wanna hope for reveg in the next 2 maybe 3 weeks , after that it’ll just be a mess. See this often in places that storm and have overcast weather a lot in April and May, like OK.
If you’re in a green house, and you really want them to reveg - invest in a light to keep reveg them now. Doesn’t have to be strong, just a flood light or something similar to interrupt that darkness. Throw it on for 3 hours after sun down or before sun up.
Maybe give them windows a good cleaning too.