Clomid

Hi y'all. Looking for a little advice. TTC baby #2.  Baby #1 was a Clomid baby. I have had my periods for 2 months since baby but have not had a positive OPK. The doctor gave me Clomid again and said I can start it right away mid cycle - even though I am on day 14 of my " cycle "   Still have not gotten a positive OPK this month .. But what if I was going to ovulate on my own finally and now taking Clomid screws it up! Help!!!