Chlomid

Stephanie
I was wondering if anyone else had experienced this. I have been on chlomid for 6 months (3 months 50mg and 3 months on 100mg) I always start my period on the 27th like clock work. I had my last period on March 27th and did not take chlomid that time. Now I am nine days late. With a negative blood test. Has anyone has chlomid affect them this way?