“Missed period concerns ”

I’ve missed my period by one day. My last period was July 11th and I ovulated on the 25th wish was I’m assuming my conception date as well. A week or maybe 2 weeks after that I had slight cramping and LOTS more discharge than usual. I’ve been cramping for the past 2 days, I’ve had fatigue, lower back pain, headaches, and nausea here and there. I took a test this morning which is one day past my missed period. I’ve been diagnosed with endometriosis a few years ago and I’ve had 2 surgeries since then which have helped my cycles so much. Also, I was Diagnosed with PCOS which i was gave metformin for which has also helped me as well. I could have either got my period on the 11th or the 16th, it’s never ever been this late.