Experiences implantation.

SDPxx
7 days before AF was due I had some light spotting for 2 days then got a little bit heavier for 2 more days then stopped. Not as heavy as I normally get with AF tho. I tested yesterday when it stopped and got BFN. AF due in 3 days. Should I test again in a few more days? And has anyone else experienced this and got a BFP?