Is my angel fish gravid?
 

I have an angel fish that it's belly or underside has gotten quite big recently and (he/she) it hasn't been very mobile lately, barely eating and hiding out in the plants instead of the usual coming to the front of the tank when I approach.

I'm wondering if it is gravid or if something might be wrong with it. Also if it is gravid how long does it usually take for the eggs to be layed?

Thanks in advance.

Pics?