Can you get a BFN 13dpo and still be pregnant?

At 11 DPO I thought I felt several symptoms of implantation...I've been on clomid (I've always ovulated regularly so my understanding is that I would release more follicles) and my husband has had his sperm checked and everything is fine there. I used an OPK and all of our BDs were timed perfectly. I took a test today and it was a BFN.

Just wondering if there's a chance I could still be pregnant. At this point I'm not understanding why it's not happening for me. 😟