15 DPO & BFN - what about my BBT chart

Hey guys! We are almost going on 1 year TTC baby #1. I charted bbt this month and used OPKs. Seems to me that my ovulation day was 7/19 (confirmed by digital advanced opk). Now I’m 15 DPO, on CD 35. Normally cycles are around 29-31 days. Negative pregnancy tests so far but haven’t tested since yesterday. I saw my temp dip back down yesterday and lost hope, but it came back up today and still all above cover line. Is there any hope at all I could be pregnant based on my bbt chart??? Thanks in advance!