Spotting Dark Brown

A little back story- Came off bc in March. Had my first period since being off on june 15th-july 8th. Had a regular period June 17th-20th. Not supposed to have my period until August 15th/16th/17th area. Sunday, I had a tinge of pinkish/brown blood in my discharge. A little more in the morning on Monday. This morning, woke up to full on dark brown discharge, like old blood. Supposed to be my fertile week, having ewcm but I don't track bbt or do opks so not sure if I'm even ovulating yet. Any ideas???