Help? Possible implantation bleeding?

Vicki
Ok so we have been ttc for 6 months, I haven't done any okp but according to glow i was 14 days post ovulation yesterday. I had a very very light brown bleed yesterday and I was so upset, 5 days early before af was due. Today it has stopped. My periods are quite regular and get heavy. Could this be implantation? And when should I test?