Brown, stringy discharge. Help :( (sorry for pics)

Women's health
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Okay... so i noticed that i had this same kind of discharge at the end of last my period. last day of my last period was 3 days ago. The discharge then was much stringier. Anyways, i did have protected sex a day ago. Now, i am experiencing this brown, stringy discharge again along with light bloody discharge. Does anyone know what this is? or have experienced this before? I have an appointment with the obgyn in 11 days. Im a little freaked out.
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brown blood is considered old blood thats mixed with discharge if u have had a period recently it could just be the remains of that or it could be a couple of other things causing it