Maybe implantation or period confused???

Hello i been ttc for like three months i had a very strange bleedin from the 19 to the 22. At first i was like ughh af is here but it was so light i barely needed anything and it was off and on like hours apart of bleedin . I took a test after it stopped was a bfn- .. did i test too soon. i never had anything like this happen .. so confused ..