Help I’m new to this!

Hi! So this is my first month TTC and I am really confused on how to calculate DPO and when to test and even if everything is going to stick. Doctors put my chances super low due to my endo (stage 3) and the fact I now only have one tube. We used preseed lubricant during my ovulation window because I don’t produce cervical mucus myself. Starting 2 days ago I have cervical mucus. To my thought I was ovulating so I took an ovulation test and I am not. I am on my two week wait and I took a few tests and all are negative. I may be dramatic but I just feel sick to my stomach thinking about a negative test or my period. I put my ovulation strips below. I am not sure if I was ovulating or not.