When did my period officially start?

Last month I had spotting/light flow for 2 days, so I thought my period started. Then it stopped bleeding (only bled for 2 days) and about a week later I started my period and it lasted 7-8 days.

I do have irregular cycles, I’m just trying figure out when my period actually started so I can see when I could have ACTUALLY been ovulating. I want to figure out if I’m pregnant or not.