With my DS1 I had loads of morning sickness... I would get to work and go straight to the toilet and vomit, it was terrible... this lasted the entire duration of my pregnancy with him.
With my DD, I had little to no vomitting or nausea. Both kids to the same father.

Then I met my DH and fell pregnant with a boy. I was sick all over again like I was with my DS1, and would get nausea when not vomitting and was constantly dizzy and just felt yuck in general.
With our second son together I had nausea only, no vomitting but still the same light headed dizziness, especially in shopping centres.
I have the same symptoms this time around (nausea only, dizziness etc) but have no idea what I am carrying.