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Brown discharge is just old blood and in itself is nothing to worry about. Could be that you had very light bleeding which was retained and is now clearing out and because it is not fresh blood it is brown coloured.
I'm 30 and my periods returned in Jan 2019 after I had my baby the previous year. They have always been regular since then. I'm not on any hormonal contraception as we use condoms.
My period is now over two weeks late, 100% not pregnant as we've not had any condom fails and I tested to be sure, my last BFN was about 5 days ago I think, so if I was pregnant it should be a clear BFP by now.
For the last 4 days I've had extremely faint brown discharge, only obvious when I wipe.
I'm starting to worry it's something sinister, I had a smear in April 2018 which was normal. Has anyone had anything similar? I've skipped periods once or twice in the past but the brown discharge has worried me!