15 dpo with BFN and no period

Amy

Wondering if it is normal to not have a positive pregnancy test at 15 dpo. It’s our first time trying to conceive. I used an opk and observed my cm. I feel like I did everything by the book to get knocked up but still nothing. I’m wondering if there’s a good chance I could actually be pregnant OR hcg would have shown by now. Has anyone had a similar experience??