Late positives?

What is the latest dpo you have received a positive pregnancy test?

Context:

• I’m currently on cycle day 34 - period was due Sunday

• I ovulated on day 17 or 18 (99% sure bc of positive opk day prior, egg white mucus, open/soft cervix, slight cramping, temp dip & rise)

• I’m now 16dpo, no period, but still getting negative tests (last time I took one was on 14dpo. Taking another test in the morning, which will be 17dpo)

• My luteal phase (ovulation to period) is almost always exactly 13 days (shortest was 9 and longest was 15 days - been tracking for almost two years)

• My temperature has remained high even though it typically drops for two days before my period

What the heck is going on? Could I be pregnant and my hormones just aren’t high enough to register yet? Am I just having an oddly long luteal phase?

Trying not to get my hopes up by thinking I could be pregnant, but.... my period is past due and nothing is seems to be happening! No symptoms, and I almost always get bloated/crampy days before my period.

Any experience/advice is welcome!