Withdrawal bleeding

Hi ladies, I recently decided to come off my BC pills, I took my last active pill on March 6th and had my normal withdrawal bleed begin on March 9th. Yesterday, March 26th I began to spot and today it is a little bit heavier but both days being brown blood so far. Is this considered a second withdrawal bleed or my first “natural cycle” after stopping BC?

*please note I have been tracking ovulation with opk’s and never peaked between bleeds*

Thank you!