If you feel this Is A Sudden Behavioral change, then take the dog to a vet, to rule out any medical issues, once medically cleared, train it. Instead whining about it on YA.
IMO, these behaviors did not magically appear... they existed without any correction, long before your pregnancy, due to lack of training, which both of you should have considered before becoming pregnant.
Dogs can not chew anything if you dog proof the premises, put everything away, breast pump, so it can't access anything. Her barking should be controlled by proper training when and how much it barks is completely the responsibility of both of you. Again training.
Dogs are not lawn ornaments to be tossed outside without supervision, and ignored nor will teach the dog anything. Kennels, crates, cages are for transport, recovering from illness, injury or surgery, it does not teach the dog anything.
Sounds like a bored/destructive untrained dog, that isn't receiving enough daily aerobic exercise, such as playing fetch, mental stimulation, such as obedience training, in addition to his routine, daily walk/elimination times.
You can't convince him of anything, regarding His Dog being gone, not your dog, however, perhaps it's a better option to try to convince him for the both of you to seek professional help on how to train a dog properly, instead playing childish video games and to act his age, not his shoe size.
He now has a family to be responsible for now, if he refuses, get out now, don't get pregnant again, take him to family court for child support, other wise this cycle will continue to repeat itself and is not a healthy environment to bring up any child.