Anal Sex

So I tried anal sex for the first time. My partner did not insert all the way and while it was very painful he made sure I was okay and after a while he noticed I wasn’t really feeling it and he stopped and we switch positions see after we finished I didn’t feel any pain or discomfort. The next morning when I went to the bathroom and wiped there was blood and it did not come from my vagina and I had noticed there was some slight pain so I had got a glove and felt a small knot/Bump on the out side of my anus and I’m thinking it’s a hemorrhoid.