The don't get pregnant, they get fertile. Tropical Angel fish deliver eggs through spawning. If the female is fertile(carrying infertile eggs,) she female lay the eggs, then the male will fertilize them afterwards.
A Fightn' Fact- Angel Fish eggs usually take less than a week to hatch.
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7-10 days
acctually it takes up to 15 days depending on the environment and the state that the eggs are in.
Angelfish eggs will hatch in about 60 hours at 80° F - according to http://www.angelsplus.com/Breeding2.htm 3-4 days.
Depending on the temperature of their water the ova can develop into wrigglers in about 60 hours.
At 80F your angelfish eggs will go white within 24 hrs if they are not fertile and should be wrigglers within 72 hours if they are fertile.