Flu like symptoms

​Before you got your BFP did you think you had the flu? Or flu like symptoms? Yesterday I was fine all day, I have been constipated for about 4 days, and then last night out of no where I got super sick and threw up, and had a loose bowel movement (was rather painful) got the chills for just a few minutes, and then all symptoms subsided and stopped except for a very pressure like feeling in my abdomen. I just feel if I had the stomach flu, I would actually feel sick. Input:) TIA