Ectopic pregnancy? someone please help

I am 4 weeks 3 days pregnant and for the last two days I have been experiencing this pain as I could only call stabbing pulled muscle pain on my left abdomen and every day it keeps getting worse. I went to the clinic (the only one we have here) and they said it was constipation but I know my body and this does not feel like it. It hurts to breathe in and out and when I breathe out it feels like something is going to snap and is only in in one spot. Sometimes the pain radiates to my right side but it's mainly around my left. I have had an ectopic pregnancy after I had my son 9 years ago and I don't really remember the symptoms then. Can someone please help me? I am terrified