Wait for your next Period. If that has not happened you should immediately consult a Good Lady GYN Doctor and explain to her in detail what you have done with your Boy friend without any inhibitions.
She will advise you further course of action to be taken by you in the matter.
HAVE A NICE DAY
RAMAKRISHNAN
Second, ALWAYS, ALWAYS, ALWAYS use a condom when doing anal.
And lastly, don't start experimenting so much at such a young age. Don't ruin the rest of your sex life because you did too many things too young.
A lot of these questions get damned silly here. Actually, it's the answers that get silly.
If you were anally penetrated you would definitely know it. Love it or hate it, as long as you're not drugged/drunk/unconscious the first time a fair sized object penetrates either orifice you would be fully aware of it's presence. Depending on the size of the males penis you could experience anything from mild discomfort to excruciating pain whether it's your first time in either hole or the 100th. You need to have a confidential discussion with an adult female that you trust or even a medical professional (doctor or nurse) to get your questions properly answered. Getting health and sex guidance on websites where the vast majority of the participants can't even spell properly is risky at best. Good luck.
Somebody is having a laugh here and a few people have taken the bait. Do people have nothing better to do with their time?
Girl this is not pretty. You are in trouble.