Unprotected Sex

I recently had the implanon/IUD taken out due to not loving the hormonal changes it made to my body. I’ve been logging my period for the last 3 months and today Glow predicts it’s a 3% chance of becoming pregnant.. I had unprotected sex with my husband tonight for the first time since having the IUD removed. Should I trust the app? & be reasonably confident that there is a 97% chance of no pregnancy? We aren’t quite ready for kids yet at this stage in our lives!