What could this be?

Hi my cycles are from 28-30days, more toward 30days from the past 3 months.On Sunday I was only 3/4dpo, I rely on my cp and cm. In the afternoon I notice when in the bathroom a pinkish spots on the tissue paper and I been cramping from earlier that day to today much more. The spotting it's gone since Sunday night.Could that be Ovulation bleeding? AF is due 5/3.Perhaps I miss it this month