One of branches seems to be dropping and I don’t know why. Please help!

From the looks of the rest of the plant I do not think that it's underwatering. Not really sure what would cause that.

 

Might of broke it watering or root rot possibly

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Shows signs of a broken branch. have you inspected it?

 

Did you bump it yesterday with the water can Or something else?

Inspect the branch from main stem connection up past the bent portion. Look for any type of wound, bored hole(s), chew marks or strange color.

If you don’t find anything let me know. It may be a vascular wilt disease. To look for that we will need to cut open the branch. If it is a vascular wilt then amputation of the branch is the remedy to prevent the fungus from spreading to other parts. No cure.
In maples, tomatoes and other common plants this disease is common. The plants roots picks up the spore and transports it through the vascular tubes. As the fungus grows it will restrict the vascular flow. The symptoms In woody plants are wilting beyond the area of the restriction causing leaves to die on a entire single branch while the rest of the plant is lush. On woody annuals like cannabis the soft stems do what you experiencing.

 

We all have bumped into delicate parts of our plants, OOPS.
If it’s just bent it should be ok only bent. If it wilts, just cut it off below the wound above the next node.
Everything else ok with the plant?