Questions .

AF is due today . On Friday And early Saturday I had mild cramping and thiought AF was coming.. But I think my cycle was off and I actually ovulated on the 17th .. So that would put me at starting today . I've been testing bfn . But then today I woke up with a pinching pain in my side . And really sore boobs , I've had a lot of watery CM . I know it's still early in the day but AF hasn't showed . How many days after possible implantation should I wait to test ?