Abdominal Cramps

I'm 8 weeks pregnant po. And I'm having abdominal cramps nitong mga nakaraang araw, hindi siya palagi. May mga certain times lang. Usually, it happens at night at pag gising sa umaga. It's like the usual cramps when I was having my monthly period. I haven't undergone any prenatal check ups yet, by appointment po kasi and on Nov. 13 pa po ang appointment ko sa OB. Is this normal po ba?