Why is my discharge this color?

I am on cycle day 23 of 24. My discharge increased over the last week. It have been yellow tinted egg white. I went in for a STD test (11/30) and was treated with a Z-pack (results have not come back nurse gave the antibiotics once i mentioned the yellow tint discharge. I felt sick all day 11/30 but figured it was because antibiotics. This is my discharge color today. I put a tampon in because Im due for my period tomorrow and started cramping . Is there a chance Im pregnant?

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