That would be the Analytical Engine. Just make sure you are not sitting in front of screens for too long to search these things, and always ask your gynac about maintaining a safe routine.
It is the Analytical Engine, but please don't stress yourself with hard studying if you are pregnant. I had severe preeclampsia and stress makes things worse, so do consult your doctor if you feel any pressure or headache.
I felt so out of touch with general knowledge during my pregnancy, but I think it was the Analytical Engine! Honestly, pregnancy brain is real, but I remember reading about Babbage's invention back in school.
I believe he conceived the Analytical Engine. If you are preparing for exams and getting headaches, try drinking herbal tea, but do consult your doctor if you have severe pain or dizziness.