Positive preg test with bleeding

Hi. I'm pregnant with my no. 4 ... I have done 3 pregnancy test. 2 had faints lines and did 1 digital it showed pregnant 1-2... but a day later I started to bleed. Not so heavy like mensus but it was quite abit. Today is day 2 and the bleeding has decreased to 1 tsp. I'm very confused. Has anyone experienced this before?