It could be that with the stomach ache and constipation that you strained a bit trying to get everything started which resulted in a hemorrhoid and the tiny bit of blood you saw. It was very light. It can be inside or outside the anal canal. I was on antibiotics for 7 days. It's really easy [though gross] to check if you have pinworms, you can go to the doc and get a sticky little butt spatula thing that you make an anusprint on. The color and amount.
I basically pooped all night well in and out of the restroom all night.
Help! I saw blood on the toilet paper after I wiped – what should I do!?
There are internal and external hemorrhoids. I am 13 and a healthy weight with a lot of regular exercise. As someone who has a background in parasitology, I want to comment that pinworms can be very, very easy to get Don't scratch it- you can, and will, get a rash down there, and man if you think it itches NOW A hemorrhoid is a swollen vein. Go get an adult, tell them what just happened and have them come take a look. To sum it up it happens about once a week to me with tiny amount of blood on paper and only hurts to wipe when there is blood on paper.