Okay... So I'm 17 and my period is irregual and I usually come on about every 2 months.
I last came on, on the 25th of August and this was normal,
I had sex roughly 2 weeks later.
I was really worried as I haven't been on, then I finally came on today.
When I came on it was a little brown discharge looking patch so I thought it would just be normal but it has now been like this all day no normal red blood just brown and light.
I was just wondering if anyone had an answer on what this could be?
Would be appreciated, many thanks :)

We get this question several times a day, no one can tell you what it is, without a physical exam anything is a guess, and there are 100s of things that can do this. One it is just the start or it is going to be a light period, happens,often. Being irregular, your body is doing an adjustment. It can be an infection of a dozen types. Of course it can be a STD.
And your concern pregnancy which of course it can be that also.

It is far too early to do a pregnancy test, and you will need to wait till end of the 2nd or even 3rd week of Oct to test if you have not had a full period by then.

We get this question several times a day, no one can tell you what it is, without a physical exam anything is a guess, and there are 100s of things that can do this. One it is just the start or it is going to be a light period, happens,often. Being irregular, your body is doing an adjustment. It can be an infection of a dozen types. of course it can be a STD.
and your concern pregnancy which of course it can be that also.

It is far too early to do a pregnancy test, and you will need to wait till end of the 2nd or even 3rd week of Oct to test if you have not had a full period by then.

Thanks for you help and answer.
I think I would be able to do a pregnancy test by now as It has been a month and a half since I last had sex and ill also make a doctors appointment.
Thank you