Can child birth change ovulation signs?

Ashley

Probably a silly question, but I'm just at a loss here. I'm 5 months post partum, and my cycle resumed right on track, and has been cycling pretty much normally since delivery. I got my period this month on the 14th of this month, and it ended on the 19th. My <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> app shows that my peak day for ovulation is tomorrow, 10-29. Since yesterday, I've noticed dull period like cramps and brown spotting. I know this can be a sign of ovulation, but I have NEVER experienced it prior to yesterday. Is it possible pregnancy and childbirth has just changed things out of the blue like that? Or should I see a doctor?