I had the procedure done on a Wednesday and it was not during or right after my period. My doctor told me to wait 7 days so the hormones could "kick in". I waited until the following Thursday to have unprotected sex. However, my period is delayed and I am worrying if there is a possibility I may be pregnant. I read that the hormones can possibly delay the period but I am more worried that because I had already ovulated the Nexplanon didn't prevent pregnancy.