Tell me what you think

So on mon 4/21 I had some spotting but it was only after I had bd right before and that was the only time that I had it. It was really light red/ brown. Do you think that it might of been implantation bleeding? AF isn't due til Monday 4/28 do u think its a good sign I've been really tired lately and have had cravings out of this world. Also my last period was weird I had only 1 day of heavyish bleeding and the other two days were very light. Has this happened to any of you lady's and resulted in a BFP