Am I just paranoid?

So I think I was supposed to start but I just downloaded this app to track my period because I'm that horrible at tracking it. It's always been irregular because of birth control. I have 3 children so to me this was strange. After I was done urinating I wiped and I had a thicker discharge with a little red but it only happened once. I'm not super emotional like before a period, not crampy or bloated. I took two tests both say negative. Does anyone else think I'm pregnant or am I paranoid?