I am on the Gianvi birth control pill (the generic brand for Yaz) and have always taken it on time for a little over 4 years now. I started my pack off last Sunday June 24th and took every pill on time except I took the 5th pill (Thursday June 28th) 4 and half hours later than I should have. On Monday July 1st I then had unprotected sex where my husband ejaculated inside of me. I plan on taking all of my pills on time and like normal, I'm just a little concerned if I could be pregnant. If so I would go get Plan B before 72 hours have passed. Any help would be greatly appreciated.