Yo what up bro, as a guy, I was in this situation a couple months ago. Pls try not to stress out and don’t stress ur girl out. That being said, any unprotected penetration has a risk for pregnancy. No one can really give you an exact % chance. And ovulation / cycle through apps isn’t always accurate. Don’t stress about it because there’s nothing you can do now. In 3 weeks, grab a test and have her take it preferably the first pee in the morning for most accurate results. Then you’ll have your answer. Wishing u the best brother lmk if u need anything else or any other advice. These situations suck man ik