17 DPO, no AF, BFN

Alissa • 30yo - been with fiancé for 9 years 💍 TTC baby #1 since Sept 2014 ❤️ 1st cycle IVF w. ICSI: in process!
This is killing me... I'm 17 DPO, AF hasn't come yet (it's usually early or on time, NEVER late) and I keep getting BFNs. I'm on month 21 TTC baby #1. This is killing me. Anyone else in the same boat?!