What Are The Chances Of Pregnancy After Taking Ipills?

Hi. I have been on birth control for years and am age 37. I took my pill on time each day but was on amoxicillian for a tooth infection for 10 days at the start of my cycle. days 8-18?
I was also taking my birth control regularly. I had sex 1 time in that period and have been on my sugar pills for 4 days with no period yet.
Should I be worries