When did I ovulate?

So I just found out that I’m pregnant and i “ovulated” on the 8th even got a positive OPK. I got a blazing positive on FR and clear blue digital. My app now tells me I’m 3 weeks and 6 days. So it says I got pregnant a day or two after my period. So did I ovulate then or really on the 8th? theres no way I’m a week and two days pregnant and it show up in a digital.