normal or not? UPDATE

I had brown period las month that last three days. Then this week I felt nauseated that when I think of food or going to eat then I feel like eww nasty lol. I've been craving salty. Also had menstrual cramps like if had my period. Is this normal? I took the test yesterday and was negative. I haven't gotten my period this month but should had my period this Saturday. Is this normal? Do you have symptoms before your period is due? Or is normal?