Two different apps two different ovulation dates

My fiancé and I just got engaged a month ago. We have a house together and are both in the military. We are getting married in April. Our ENTIRE relationship I have been on BC and he has always pulled out. Well this month I forgot to put my BC in due to our schedules. We had sex on Saturday and for the first time he didn’t pull out. I told him I missed my BC and he said “we’re engaged now. If it happens it happens”. Fast forward to yesterday it happened again! I swore it was a fluke the first time. So now I’m stupid invested. I have wanted a baby since I was 18. I’m turning 27 this week. I have two different cycle apps and they are saying two different things for ovulation. I bought an ovulation test and I don’t know what to think now.