A little poo on the strep b swab?

I got my strep b test today and they sent me in the bathroom to do it myself. I had no clue what it was or how to do it or how the fuck far 2cm is 🤷‍♀️ BUT I had a bm before my appointment so there was a little poo on the swab. Is that normal? or am I going to be taking a walk of shame next week when they tell me I need to do it again...

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