TTC while breastfeeding?

Hello! So, my af returned in June, after my baby turned one in May. I've been having regular cycles since then. We've been very active bd' ing most of the month. I took a test today, because around the 16-17th of this month I noticed some brown discharge. The next day it was red streaked. Could that have been ib? Any input is welcomed :) 
​Thanks in advance. 
​PS test was negative with fmu.