Birth control failure?

On combination birth control - take it perfectly. Period is due next week. I have had sex this month, but with extra protection although I had a broken condom.

I was on steroids this month (NO antibiotics, I know they make bc less effective ) to treat some inflammation I had. However I didn’t tamper of the antibiotic correctly, and headaches are a side effect.

Been having mild headache in the same spot for four days, no other pregnancy symptoms.

What do you guys think?