Broken condom and sugar week of BC

So I had sex with my boyfriend today on the 28th day of my cycle, expecting my period in two or less days as I’m on the second day of the sugar pill. Condom broke after he finished inside me, however I take the pill for acne and was told not to be too stringent with taking it exactly the same time each day - it’s always within an hour and I’ve never missed. I also get my period on time which I didn’t before the pill so I believe it’s been working. However, I was wondering about my risk of pregnancy. I understand that the pill is used precisely for this, however I’m a worry wart and want to know that I’m not thinking irrationally here.