Angels don't get pregnant, they lay the eggs, then the male comes along to fertilize them. It's not unusual for a female to spawn with no male present, and to guard the eggs as if they are fertilized. Needless to say, the eggs will not be fertile, but it is a good sign. Fish that are in a healthy environment & feel safe are the ones to spawn, so it says plenty about the quality of care you give to your fish.
Angels will not breed with gouramis.