Had sex om ovulation day. now i'm having very light pink spotting.and that's all i had.i had no flow of a regular cycle.what is this?

Incomplete informa: Day 1 of your cycle is the first day of bleeding. Your chances of becoming pregnant increase from day 2 through a 30% chance on day 9. At week 6 onward from your sexual experience, i'd consider taking a pregnancy test. Many women have irregular cycles in terms of amount of flow and number of days at some point in their life.