Occasional Mid Cycle Spotting. Of this?

Hi Doctors, period dates - Nov 16th, Dec 11th. In between these 2 periods, I got mild spotting on 1st of Dec and on and off from then. It was very mild so much so that my undergarment aren't getting spotted. The blood colors are light pink, red, brown and very dark brown as well on different occasions. The blood is seen mostly when I wipe with a tissue. I got my thyroid test, pelvic scan done and all is normal. Dec - Jan cycle was normal with no spotting (only white and cream discharge. Period date was 5th Jan). Now my ovulation date was around 16th Jan and again this month I had very mild spotting around that time. From then on I have very light brown and cream color spotting when I wipe with tissue. No smell or anything. What can be cause of this? Have a 6 year old son and had a normal delivery. Sorry for the long post. Thank you 🙏