this does happen, but it's very uncommon. Most women will test positive when their periods are due or late by a few days.
there is a lady on this site who didnt test positive by hpt or blood tests unyil a scan showed she was 15 wks, one of my pregnancies didnt test pos until
i was 8 wks so its different for each woman and each pregnancy
I bled nearly the whole first trimester with my daughter, but my tests were showing positive before I ever started bleeding.
yes you still could be if your bleeding was different from your usual period, some women have a period like bleed because there isnt quite enough hcg to stop one, but enough hcg to keep the pregnancy viable, I would retest in a couple of days making sure you use first morning urine and good luck
If the test was negative an you bled shortly after, I'd say no. test again with first morning urine to be sure.