Is this normal? (look inside for details)

Over new years I started getting a really bad pain on my tailbone, that gradually made it almost impossible to sit, walk, sleep, and pretty much lay down unless it was in a specific position. Anyways, I went to the doctor 3 days later, and he told me I had a pilonidal cyst. He drained it, left the wound open, gave me an antibiotic, and said it could drain for 2–3 days, therefore I was wearing gauze and all. Everything was fine, until right now, when it began to drain on its own. Its sticky, foul smelling, brownish, and with blood. I thought my wound had already began to heal, so is it normal that a week after the drainage, it drains on its own? if so, how long is it supposed to last? do i go back to the doctor tomorrow morning?

Thanks for any help :)