Please consult gynaecologist, as the bleeding which came on 18th May, it can be implantation bleeding and you might be pregnant that is why you got positive test result on kit. If bleeding was not heavy then it must be implantation bleeding. Better you consultant a gynaecologist.

Hi go for blood test and consult your gynecologist.

If your periods just passed u cant be pregnant right after that if u would miss periods next month then check after missing periods