Anyone else's toddler acting out over new pregnancy?

My daughter has been screaming nonstop over absolutely nothing for the last few days. She'll be fine one minute and then all of a sudden she's screaming, crying, drool soaking her shirt and won't stop for hours on end. There is nothing wrong with her, and nothing besides us being pregnant has changed. Our routine is still the same, I have no morning sickness/fatigue yet, so she's still getting lots of attention, but I'm at my wits end. I've started just sending her to her room because I can not deal with it anymore. She's not sick, teething, nothing! Just miserable. She just turned 2 so I don't think she even understands that there's a baby coming yet.