Endo and abnormal bleeding

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I’ve been diagnosed with stage IV endometriosis and have a laparoscopy scheduled for a couple weeks from now. I’m six days away from my scheduled period and am experiencing light-medium spotting on and off. It’s been that way for about a week and a half now. Any thoughts? I wondered if I could possibly be pregnant because of nausea, but that seems impossible after TTC for a year with this diagnosis.