Congratulations! I think I may be pregnant, with my second, albeit in the very early weeks. I'm getting negative readings on the tests, but feel unusually tired, emotional, have felt travel sick most of today (that wonderful grey faced feeling!) and have uncomfortable cramping a mix between the feeling you get when you're ovulating and af.
I think that every pregnancy is different and affects you in different ways. Although if it keeps on feeling bad i'd book in with your doctor for a check up.
How old are your first two children? Mine is 13 months and has taken her first steps on her own tonight! Amazing!!