Expect to move way slower and more leg cramps along with being a bit more out of breath and heartburn lol braxton Hicks are worst than before for me too plus for some reason i urinate so much more lately
The renewed energy that you found in the second trimester will be gone! I've experienced a lot more Braxton hicks as well
Definitely childbirth ;) but on the serious note you may find being more tired and everyday activities will be much harder to do.