Feeling blue

My name is Tessa, I am 32 and currently 10 weeks pregnant with my 3rd. My son is 11 and my daughter 10. I felt like a dark cloud was following me around during my first pregnancy, and the second pregnancy happened so fast maybe I didn't have time to notice I was depressed. I thought this time would be different since I'm a decade older and feel much more secure in life. I feel sad again this time.... anyone else dealing with pregnancy blues?