I only have one child. I am on my second pregnancy. I was sick all day for the first 12 weeks with my son. I am now sick all day with this pregnancy also, but now it seems to be more around mealtime that I am nauseated. My sister is having a boy and she was only nauseated in the evenings. I think it is really just random what you get and what the baby's gender is. I had a friend who was nauseated constantly and had a girl and then got pregnant again and never had any aversions, nausea, cravings or anything and had another girl. It's fun to guess though :)
With my 2 girls I was not sick at all, the only symptom I remember in the first trimester was fatique. Now pregnant with number 3 I have been sick (but not vomiting) in the morning and at night. I often wonder if I'm having a boy this time due to the sickness factor!! Only time will tell!
i was sick all day from about 7 weeks until 12 weeks...then it turned into only being sick at night...im currently almost 26 weeks with a girl!!!
best of luck