BFP after implantation spotting?

Estelle

I have no idea when I ovulated but I spotted for 3 days. Only when I wiped and was mixed with discharge... I’ve been testing with the cheap online HCG test but test neg, but I’ve been cramping too

When would I get a BFP after implantation? On a cheapie? On FR?

I just want to know if there’s still a chance

With my first I tested negative until 13dpo but didn’t have implantation bleeding

Please someone help