No cover line and possible ovulation...

Kelly • 33y/o, PCOS Baby #1 16 April 2018 👶🏽💓 Baby #2 4 October 2021 👶🏽💙
First time temping, planning to start TTC for baby #1 in Jan/Feb.
I stopped BC on the 30th of September. Withdrawal bleed started the 2nd of October. I had some random spotting since the end of my withdrawal bleed. Since then I've charted two BBT spikes. Is it possible I ovulated during my withdrawal bleed?
Also, how long does it take for the cover line to show up?