What day do I use to predict ovulation.

Paulette • 39 weeks Pregnant at 38 y/o after 5 miscarriages

Hi!

So my period this month was a little weird. On August 5th I started spotting for the entire day. Then it stopped, and had no bleeding for 2 days. To be safe I took a pregnancy test and it was negative.

So on the 8th period came in full vengeance and did not stop till the 13th. Based on my app it says ovulation day should be in 2 days because it is going by the 5th as my cycle day one. I have been using the strips and they are

Super light.. do you think cycle day one should actually be the 8th which would put ovulation later?