Did you ever get fresh blood? If not you might be pregnant. I would wait until you should get your period again and then test
Thats old blood. It is completely normal.
Brown blood is old blood, and often comes before or after a females cycle. In a previous post you stated that you had sex a week before your cycle was due. If you had late ovulation it's very possible you could end up pregnant. There is NO safe time for unprotected. You need to wait at least two weeks after sex to take a pregnancy test. It would also be good for you both to use protection unless you're trying to end up pregnant.