Could Delayed Periods Be Due To Infertility Pills?

I m 52days since my last period . had negative urine and blood test on my 52 day. My hcg level is 0.10. My cycles were always regular 27-28days since my first menses except last Dec(2 Mon b4) which was 39 days long. Was on infertility drugs for 2 Mon (Oct,Nov). Going crazy pls help me out