Emotionally Fragile.. going crazy here!!

I'm 21 weeks pregnant and crying at the drop of a hat!! and the hat falls multiple times a day 😭😭😭😭

Not only am I crying and tired, I also get sooo angry, soooo frustrated. I'm mad at the smallest of things and just burst into tears literally anywhere.. picking my daughter from school, cooking.. uh..

is this unusual? what's going on! I want to get back to my original self..