Return of ovulation usually occurs within six weeks in the majority after removal of the implant. The spotting you have been observing is most likely due to breakthrough. If conception occurs, implantation
bleeding is observed around one week -10 days after conception as the embryo implants itself into the uterine wall. It is a fresh bleeding, not brownish but red or pink in color. It is difficult to say without a proper temperature record to say if ovulation has occurred. Recording of basal body temperature
should be done systematically. You can test for pregnancy
if you miss your period. Wish you good health.