I've experienced a light brown discharge for the past 3 days when my period was supposed to start on the 14th. Today I have no discharge at all. I have also experienced multiple pregnancy symptoms such as nausea at certain times, lower back pain, mild cramping, a weird feeling under my belly button almost like it was being pulled in? And feeling super light headed. My period has always been mostly on time and I always get really bad cramps that start a day before so I can always feel it and I've felt nothing so far.

I tested yesterday morning and it was BFN. Has anyone else experienced this discharge and found out it was implantation bleeding and later on got a BFP?

When should I test again if it was implantation bleeding?