Some bleeding

I am no doctor but you might have piles. Little bumps sores just inside from your ring. You may of upset one. Or you may of just burst a blood vessel. You used lots of water based lube I guess?Give it another day or so and have another go, it may never happen again but if it keeps happening its time to see a doctor and just say you have had bleeding. No need to say anything about aneros if you dont want to.
Good luck hope it all settles down for you

I used coconut oil, same as the other times. No more blood ever since and I haven't used the SGX since. I'll go back to it tomorrow night.

Some sort of a burst blood vessel sound most plausible and probably unrelated to the SGX. If the SGX had anything to do with it, seems like it would have come out with evidence but no blood until the next night. And that was probably like a quick gush and the end. Maybe I had my first "period". Haha.

I plan to go see a urologist so this is another thing to add to the talking points.

Thanks.