What DPO am I?

Michelle

Little background on me. I am 39 years old. I have been married for 6 years. (New marriage) I tied my tubes after my daughter who is 7 years old. We did 2 Rounds of <a href="https://glowing.com/glow-fertility-program">IVF</a> and it failed. Got surgery to reconnect my fallopian tubes. If time monitoring ovulation.

Have 3 apps and each app says a different date for my DPO. One app I have had forever monitoring my periods say I am 9dpo and others say 8 & 10. Not sure which one to believe. Please help! Ovulation peak on the cycle day 16. (Sept 14)