Hi doctor,
I've been on birth control since Nov 2015 and only last month (September 2016), I switched to Diane 35 after my doctor asked me to. I took the pill regularly on time for 11 days. I went on a vacation after that and for the rest of the 10 pills, I took them with a delay of 3-5 hours due to timezone change. I never missed a pill. Also, during my vacation, I had unprotected sex with my boyfriend. Now it's been 4 days since I took my last active pill and I still haven't got my period. Is there a chance of pregnancy? Or is it just stress?