Positive OPK CD 20

Has anyone heard of or gotten pregnant and ovulated on CD 20 or later with a 27/28/29 day cycle? Just got a positive OPK today.. last month I was thinking my period would be pushed back because I ovulated so late & then I started to bleed 7dpo thinking its was implantation bleeding but it was just my period 😞 but anyway .. is it possible?