Can you tell that your pregnant even your period is not due?

odette
My period will be around next week, but since yesterday I have morning sickness already. Feels like you about to throw up. Then today just now this morning I throw up already. I feel so sick like you know the feeling when you travel and feels like you about to throw? And you actually throw up? 
I really control or fighting not to throw up but I can't hold it anymore so I throw up, but only like water maybe because I don't have food in my stomach yet. And yesterday I only eat breakfast and I took BM already I don't eat lunch and eat dinner though but only vegetable and I took another BM again. I hope somebody can answer me.