Ob-Gyn questions? Ask a gynecologist online.
This bled could be one of two things.
One - it could be an implantation bleeding but you have taken the pregnancy test too early. please repeat the test after 7 days of the bleeding for a correct result.
Two - ovulation and periods can be irregular in the first three months after removal of an IUD due to hormonal imbalance. In your case, it is possible that you did not ovulate this month and the period is not a real period but a withdrawal bleeding.
Please repeat the test after 1 week. If it is negative, then this is due to a hormonal imbalance