My middle two were 18 months apart and we room shared with both for about another year. One was in a bassinet the other a crib which we transition to a toddler bed before we moved him to share with his brother. I think it can work totally fine provided you have the space for all the beds ☺️
Im in the same exact situation, i have a 16 month baby girl and due on Nov. We lived with my parents and trying to figure out how to not disrupt the big kid sleep but a friend told me she will just build more tolerance to noise
Although this is my first pregnancy I will be sharing a room with my baby until I can afford others wise however I have a very close friend who had been the same situations having had a son that was one and then had been pregnant with twin girls they all shared a room for about two or three years and they all managed just fine . Good luck xox