Any insight?!

Chelsea

We've been ttc for a year since our last missed miscarriage. I had a work up done since I was having an absence of my cycle for months on end OR irregular bleeding lasting longer than a month. I swapped doctors in November bc I felt like my old doc wasn't taking anything I was telling her, into consideration. I asked for a pcos workup to see if that could've been an issue, she said no. My new doc ordered the workup right away without me even asking about it! I got my results back & see her tomorrow. We did a medicated cycle of letrozole 2.5mg & im currently 12dpo. All bfn tests but I wondering if these results could be why I'm getting negatives? Maybe I wasn't able to implant?