I'm sure we're covered this topic before

But I'm anxious because I start work tomorrow. Baby is 16.5 weeks old. Still sleeping about 10 hrs at night. But, now she screams during phases at night. Last night it was 11,1, 130, 4 am. This is night two of this. She has her eyes closed and by the time I walked into her room the first time she was back asleep. Isn't she too young for night terrors? Is this just her learning to transition through sleep cycles? I've been sleeping so good for weeks and now this is just like a shock to my body. When she screams I end up staying awake for a while watching the monitor checking on her.