Little help please?

Sammy • I have the most amazing husband ever an adorable 6 year old and a beautiful baby girl born 7/27/16!
I'm 4 weeks and 4 days pregnant with baby # 2 and I've been having slight cramping feelings in my lower abdomen. I don't remember having this issue with my first yet again I didn't know I was pregnant until I was 12 weeks with my first. So... Is this normal? Should I be worried? I have my first doc appt on the 3rd of Dec.