So, I have nexplanon(I'm on round two, to help the treatment of my endometriosis) and my periods are normally abnormal. (Three days at the longest when they do come, usually every two months). Well I had intense cramps(bad enough for an ER visit to be excused from work) at the beginning of the month, but no bleeding at all, not even spotting. Now it's three weeks late and I have a murky grey chunky discharge? (With more intense cramps) What is this? It's not brown like "old blood" spotting/periods.. (Aside from another doctor's visit, I'm moving soon and don't have enough time to get in to see this OB/GYN) Any suggestions on what it is or what to do?