Hi Mercury,
your baby may or may not be SGA, more likely the sonogram is not gauged (they normally aren’t). If it eases your mind, you should demand your OB-GYN to refer you to a center where the ultrasound machine can provide absolute measurements (ie in mm) and error bars. You pay for care, you are entitled to. If your baby should turn out to be indeed SGA and he/she is proportioned, probably the ob-gyn will advise to ignore it: given 100 healthy babies, obviously someone will be in the smallest 5% and someone else in the highest 5%. If the measurements are not proportioned, again this does not mean health problems R”L, it just increases the likelyhood, we all know people who are not well-proportioned but are healthy, some are athletes. Still in such a case perhaps you may want to give birth in a hospital with a NICU, not because it makes a difference to the baby (they ship babies quickly and effectively, including grand preemies) but because if you just gave birth and are tired etc. one thing is to walk to the babies’ ward, another thing is to sign you want to leave, and go to the other hospital. Wishing you an easy birth, with perfect health and strength for you and baby.
As for the parakeet, I wish you that it survives. I never had any pets nor do I want one, I was taught keeping pets is an aveira which leads to more aveirot, so, my humble opinion is, try to care for this bird, but then, if you get so emotionally attached, may be it’s not worth getting another. You may find sympathetic support among nonjewish animal lovers, I call such people all the time when there are unwanted pets, they are very good at finding an accommodation and they raise money – may be they can help you with a part of the bills.