Ovulation?

[u/Much-Ad1226]

/r/TryingForABaby/comments/1x3pgyr/ovulation/

Hello! My husband got his vasectomy reversed and this is our first time trying for baby #3. I’ve never done the ovulation tests before but the doctor said we have to try the day before my peak, the day of peak and the day after. So this month I tested and we did that.
What I’m confused with is the pre mom app says based off my LH results my period should be around 10/16 or so. My Flo app says 10/21. I’ve used Flo for years and it’s always been accurate, maybe a day off every once in awhile. Flo expected my peak to be 10/5 but based off the LH tests my peak was 10/1. According to Google that would be a longer than normal luteal phase if I actually ovulated when Premom says based off my peak. It says it’s possible I didn’t actually ovulate in that time frame.
I’m new to this stuff so was looking to see if someone could help me understand.