Pregnant???

My fertile window started on March 21st and me and my partner had unprotected sex on the 22nd. According to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and other calculators, I’m supposed to be ovulating on March 26th. We took plan b right away. Will plan b work??? I’m really stressed out