If the lump has just popped up, and isn't painful, u can get it evaluated on Monday.
Most of the times, a non-painful watery lump is a mucocele, which is accumulated saliva when the draining duct gets blocked.
It may subside on its own or may need puncturing.
For now, enjoy the weekend!
Next Steps
Consult a dentist
Health Tips
Keep a check. Is it increasing? Is it hard/ soft? Location? All these answers will help the doctor reach a diagnosis.