Anal??

So, me and my so just did anal for the first time. First time as in, we haven't even had normal sex yet, but we were in the mood and had no condoms on hand. Anyways, we didn't have lube either, but I was very wet and spit, so it didn't hurt all THAT bad, which also isn't the topic... anyways, I bled a tiny bit after (right now) and it feels like I have to poop but I can't, is this normal?