Am I pregnant??!!

I don't want to jinx it but I may be pregnant. my periods have been really screwy lately, normally I have it at the end of the month and its been at the beginning. They were both pretty light too, and I generally have heavy periods. I had periods when I was pregnant last time as well and they were like this.
I've been throwing up for over a week, itchy breasts and smells are making me horribly sick! Tuna fish, thai food, gasoline, BO... eeww my stomach just drops :)
Oh God I'm getting scared now!! I took some at home tests and went to planned parenthood and they were negative, but the nurse said I could still be pregnant and maybe  theres not enough hormone in my system yet and to either wait two weeks to come back or go take a blood test. 
I know it seems weird that I would have morning sickness before a positive test, but I must be like extra extra sensitive to  this because last time with Sophia I swear it only took a week after we conceived before I was incredibly sick all the time. I didn't get a positive test for another month and a half after that. AM I CRAZY? 
God I hope I'm pregnant because if I'm not then I'm freaking sick! pray for us!