HELP!! Negative pregnancy test after 3 positive tests??

Shelby

Okay so i have taken pregnancy tests for the past 4 days and the past three days I have been getting faint positives (getting darker by the day). All of those were the pregmate brand. Then this morning I took two first responses and they were both negative. I’m SO distraught and I need opinions!! I honestly don’t know what to think .. (pics in comments)

The first day of my last period was dec26th and I’m 15dpo as of today

I have PCOS and took letrozole to induce ovulation with peak day being Jan 10th