What Causes Brownish Red Discharge From Vagina After Period?

I had my tubal reversal on May 7 2014, just one month ago. I had my first menses 2 days later, it was five days earlier than it had been the previous six months and lasted nine days during which a cyst developed and burst, what a week! My next ovulation was the evening of May 29. We made love May 31, after the OPK went negative. Today I am 9 DPO, yesterday I began spotting a brownish pink fluid when I pee for a few hours with some mild back cramps. Today I spotted again in the morning along with a temp dip. This afternoon the fluid is now dark red blood along with cramps and backache and headache . I had 30 day cycles before surgery. Is this normal or could I have had an uh-oh, this early?