As the title says. Not sure what I should do. Cut it immediately? Just start flushing then chop it in a week? These pics are the same plant.
How many plants do you have?
I would keep going with it,I reckon you have about 4 weeks to go.
Have three. I don’t see it on the others.
I would keep going with it.
Sounds good. Is there anything I can do to prevent more from producing? Also, should I trim off branches I find them on or just let it be?
Just look over for nannas and if you find any ,pluck them off with tweezers.
You should be OK now. 
Sweet. Thanks man!
Look for nanners as suggested. A seed here or there isn’t uncommon. I look at is as a little gift. A bunch of seeds, especially in clusters, is pollination. But a small few isn’t anything to really worry about. Just be vigilante, make sure light source isn’t too close or hot, and keep on keepin on!