Is it normal to feel emotional in pregnancy?

Absolutely. Pregnancy is very stressful. Plus there are a lot of major hormone changes and fluctuations. This can produce a lot of volatility of mood and emotions. It's a normal tendency, so it's important to have someone to talk to, to talk through things and let you get it off your chest. It's normal to feel overwhelmed sometimes, but you need to talk to someone about it.
Yes. Emotional feelings are influenced by the changing hormones in your body with pregnancy. Estrogen is the hormone produced during pregnancy that may influence your mood. Progesterone levels early in pregnancy may also be responsible for mood changes. If you find that your mood changes are erratic and associated with a depressed mood, let your doctor know as this not be normal.