does anyone have an idea of what is going on with my parrot

i have two parrotlets 1 boy n a girl they are both in different cages but they fly around during the day tg recently my female parrotlet has been plucking all her front feathers and a few of her back feathers and has been getting aggressive i think its from hormones because my boy bird throws up in her mouth sometimes and she is starting nesting behavior in small dark shots. idk if she is alr pregnant or what i should do moving forward. they are both on a proper diet of fresh veggies and harrisons pellets and all that so i dont think shes plucking from improper care or there diet. what should i do if she is alr pregnant bc id hate to take her babies from her but i also cant keep them. and what do i do to correct this behavior if shes not pregnant because i have no idea what is even cause her behavior because theres nothing in her cage or around that is making her hormonal like this? any advice is highly appreciated