Why am I so clumsy lately?

Hey. I was just wondering about people's experiences. I am 18 weeks pregnant, and lately I have become extremely clumsy and forgetful. I keep forgetting some things that I normally wouldn't do, and I also am so clumsy its not even funny. Today alone, I burnt myself twice, and cut myself. I feel like Im so stupid, I should know better. lol Does this happen to alot of women during pregnancy? Thanks.