Long luteal phase??...help!

Does anyone else have a long luteal phase? Over 16 days? I don't know what's going on with my body! 😐 I'm 17 DPO and no sign of AF. I've taken pregnancy tests and all have come back BFN. I feel confident of my ovulation date.. It was detected by 2 apps b/c of my temp increase and I got 2 days of positive OPKs right before. I tried calling my doctor and she hasn't gotten back to me yet. Anyone have any advice? Is this long luteal phase possible or could I maybe, just maybe, be preggos??