Is it normal to have no pregnancy symptoms at 4 weeks

Why not. ​Maybe your body is more sensitive. I did not have any symptoms at all during all my pregnancy, and if it were not the absence of menstruation, I would not even know that I was pregnant. My sister-in-law threw up the whole pregnancy from 4 weeks.

Moms Expertise
    8Theresa Gould
    Everyone is so very different. I just cannot imagine what it must have been like for your sil. I had a friend who was like that and I felt horrible for her and guilty because my pregnancies seemed so easy when compared to what she was going through.