13DPO -No symptoms BFN

Hey ladies,
I am on 13 dpo and we dtd every day of fertile day. I did get my peak on my 11 and 12th feb. so we dtd on those days and 2 daya after. I have absolutely NO symptoms and AF is not here too. So I decided to take a test this morning which was BFN. I thought it would be a negative since i have like no symptoms. Any ideas whats happening to me or has anyone had the same kind of situation ever. Any thoughts please help !!!!