DPO Day 5 - unsure of AF timing

Brooke • TTC/IVF for Rainbow Baby #1, tubal infertility

First month TTC (well, first month tracking TTC...previous 4 months we weren't tracking).

Just came here to say that I am 5 DPO and have 3 fertility apps that are telling me AF is supposed to show up on 3 different days with the exact same input. (I'm not super regular cycle wise, sometimes it's 28 and sometimes it's 33, etc)

Who else here is DPO 5 and/or aren't sure when to determine first day of missed period/when to test??