Signs of ectopic pregnancy

Courtney
I am 5 weeks along and I haven't yet gone to the doctor. My appointment is on Tuesday. All yesterday I had discomfort on my pelvis/uterus. Today it seems located on just the right side. It's not intense pain but it is dull and constant. I am trying to decide if I should go to the hospital or if I'm overreacting. Can anyone please share how they knew they were having an ectopic pregnancy? Thank you.