What Causes Vaginal Spotting With No Regular Period?

Hello I am 31 Female, trying to concieve, as per prescription of a local gyn doctor, I had taken CLOFERT 100 Climifene Citrate on second day of my period for 6 days (my period is usually heavy and lasts for 6 days) but after taking CLOFERT 100 the bleeding stopped on 4th day. We had intercourse on Day 10th through 18th everyday. On the date of my expected menstruration I did not get a bleeding; however, spotting started the next day, the same also continued on the following day. I am confused whether this is a Period or implantation bleeding or a side effect of CLOFERT 100. There is no pain yet like a regular menstruation, getting whitish egg white with tinge of spotted blood on it, not regular heavy flow of blood. Please advise