I am experiencing cervical mucus that is brownish. She has assisted at over 1,000 births and is currently teaching in the nurse-midwifery program at the University of Minnesota. I'm assuming that you are not pregnant, but rather checking cervical mucus for fertility purposes.
Brownish discharge is almost always old blood.
When the fertilized ovum burrows into the uterine lining, some blood is often released and passed as brown discharge. Most women hardly notice it, but those who check mucus patterns are very aware of it. So, yes, it could be ovulation, but it could also be implantation. You could check cervical position and basal body temperature to confirm this in your next cycle. I wish you the best with this.