My Apple Watch will not charge. It shows the red charge for a moment then goes back to normal watch face with no power lightning bolt in site and is in power mode. . Not sure of what to do.

My Apple Watch seems not to charge. It is in power reserve mode and once connected to the charger it shows the big red power bolt for only 1 second then goes back to the regular watch face. I do not see any red or green power bolt showing on the screen. So not sure if it is charging or not. I have not had any problems before charging my watch. I have made sure the back is clean and charging cable is looking great. Tried to reset and the apple signal showed up. So not sure what to try next?