11 dpo AF due 4/18

Jessica • Married sept 12 2015 ttc for #1 since june 2014 BFP July 2016 due March 23rd 2017
All my cramping stopped. Took two tests and they were negative. 1 at 9 dpo and 1 at 11dpo. Im thinking AF is coming. I have no other symptoms. I really dont understand it. Could a deep cervix cause issues?