Congrats, and good luck to you!
Coming off of birth control can make your normal cycle very irregular.
If I were you, since you’re trying, I’d join another app forum specifically for that. Other women on there may be able to share struggles with this better than us here, as mostly all of us are trying to not become pregnant, so we may not have advice you’re looking for! We’re all hoping our IUD(or BC of choice) will work! 🤣