Thank you for posting your question here, I will try to answer it to the best of my abilities.
A brown discharge on its own is not something to worry about, it usually means that during your last period all of the blood didnt come out and its coming out now, that is why it is brown colour and not bright red.
So if you arent feeling any other kind of discomfort, dont worry about it.
If you are still worried, you can take a home pregnancy
I hope this answered your question.