Thanks for the query.
After stopping of hormonal contraceptive
methods it will take sometime for the adjustment of hormones and regularization of periods.
So if the ovulation returned in your case and you had unprotected intercourse
around the time of ovulation then there is possibility of pregnancy and the bleeding you had could be implantation
As sometimes urine pregnancy test kits cannot detect early pregnancy better to go for blood test
once which can give more accurate results.