when we were still in our deliberation phase, i said to my husband "i don't want things to change, but i can't do an abortion. i don't want to have an abortion" that was how i felt even before, and everything got to me, and now it's so tough, and no baby to snuggle with in sept. i can't comment on if the feelings will get better, i know i was worried it would continue through my entire pregnancy, and that ate me up. but now i have no baby to look forward to, just the procedure to reexperience over and over.
either way you go, it's going to be mentally tough for a long while. i would undo it if i could, but that's my situation. everyone's situation is different. my husband was concerned with how i'd handle 3, since most of it is on me due to his long shifts. it made me feel worse, because i felt that i had no patience, and so many times thought and said to my kids that i was done and can't do it. it crushed me. it broke me down thinking i was failing my two wonderful kids, and how i'd fail even worse with 3. that was definitely a big factor in our decision. i don't know if i'd have felt better eventually, but i continuously think i would have. you know, go to the appt, have some eureka moment, walk out and be 100% confident in myself... but who knows. would it have been the rest of my pregnancy worrying and then blaming the baby for any stress?
there are unknowns either way. and i'm sure everything you read is just a "that's nice, thats you and you're not me" type of thing for you. that's all the posts i read before hand were. they rolled right off me, and i didn't consider them.
it may be tough, but having that baby, and giving it and you and your family the chance is worth something. good luck.