Large dip!!!

Hi! I am sooo confused. I put period in my app because I spotted for 4/5 days. It was super light barely there. But I put it there because maybe it was idk. However I am also assuming it was not. I am curious what y’all think of the dip. Does ovulation cause a dip them drastic rise? We did do the deed October 21. I honestly have no those ovulation symptoms. I also did spot the day after the drop. Small only once when I wiped. I am soooooo confused. 🤔