Anxiety about early pregnancy

This should be a time of happiness as just found out I’m pregnant a week ago haven’t been to the doctor as no appointments till this week when I’m going. I’m about 4 weeks 5 days pregnant.

However I keep thinking bad things may happen or am I still pregnant. I keep getting an moderate/intense cramping just like PMS but nothing else but it’s really playing with my mind.

This is my very first pregnancy, is it normal to feel this anxiety?

How has everyone else feeling?