So confused.

I just started this journey. My husband had a vasectomy almost 5 years ago and recently got it reversed. We haven’t started trying yet because he’s still healing. Anyway, I’ve never tracked ovulation before, I do have a child, he’s almost 6. I should be able to conceive again, I’m hoping, if his surgery worked. This app has really helped. I just got off my period. Should I use tests to confirm I’m ovulating when my app says I am?? The week we’re aloud to have sex is the week this app says I’m suppose to ovulate. Would it be a good idea to pee on an ovulation test to confirm if the app is correct? My cycles have been off for a few months considering I was on BC. It should be out of my system now though. Please help!