Bleeding after intercourse

This has only happened a couple times, but after having vaginal sex the next day or later that day I notice spotting coming from my anus. It's not alot, barely noticeable, but I'm worried. Again the spotting has only happened a couple times after sex, usually it doesn't happen, but it's from my anus and I've only had vaginal sex so I'm kinda confused and a little worried about my health.