Hey, My Name Is Jai. I've Been Trying To Conceive.

Hey, my name is Jai. I've been trying to conceive. My ovulation occur on the 8th. I was sexually active on the 7th, 8th and 10th. My expected cycle would have been the 24th. I was 3 days late on the 3 day i bleed for 24 hours not normal bleeding. It was red then brown now pinkish like it's going away. I took 3 test which all came back negative. Could I still be pregnant?