ugh! isn't it too soon to feel sick?

Lucy
I'm 4w5d. 
Today I woke up feeling sick. Forced myself to eat breakfast (first few bites were hard to swallow, but then it got easier). 
Then was super hangry at 10:30, and started feeling sick again. Ate lunch. Now feeling really gross again!
I didn't feel sick with my last pregnancy (which ended in a miscarriage). 
Is this feeling even tied to being pregnant? Isn't it too soon?