I administered my own Group B Strep test

Today I had my GBS test done and gave it to myself...

When the nurse asked me if I could leave a urine sample she also instructed me how to swab myself and handed me the tube. So I did. I definitely thought it was weird and asked my best friend (who is two weeks ahead of me and goes to the same office) why she never said anything. She said they did it for her!

I'm not sure how likely it is that I could have done it wrong but I definitely don't feel comfortable with the fact I did it myself. It was kind of like "well I hope that was right!" This is also my second pregnancy so I know it's usually done my the doctor.

Did any of you ladies have this kind of experience? Should I say something or ask for it to be redone?