Anyone elses kids??

Anyone elses kids start axmcting out of character or really really bad before labor? Im 32 weeks but the last couple of days my almost 3 year old constantly wants to talk back, yea at 3. He ignores me when i tell him not to do things and he's usually pretty on point about listening. And my 1 year old is beyond clingy like BEYOND.!! She has quit sleeping through the night and will cry until she can't breathe or even thrones up if me or my husband don't pick her up. She never used to be that way. Is it just kid things or can they tell or what.