Belly button bleed

Hi, my baby’s umbilical cord fell off about a week plus. After a few days, i noticed that her belly button has blood. Went on about 2 days, 3rd day theres no blood at all and the 4th day, theres blood again before i bathed her. She’s 3wks old now. Is it normal? Theres no redness/swelling & she doesnt seemed to fuss/be uncomfortable when i cleaned her belly button. Please help me out if i should go to the doc’s or is this a normal thing & just wait it out & let her belly button dry properly. Thank you so much!!!!