Is it normal

Rosi
Hi, i got my positive result yestaerday, according to Glow m 3 weeks 2 days preg. M having lower back pain n cramp on lower front, dont like to eat anything and tired all the time. So my question is , is it normal? Isnt this lil early for these symptoms ? 
This is my second but i didnt ve any these things on my first preg.