birth control and antibiotics

probably a dumb question. I’m on the pill tri spritec & had unprotected sex about 4 days ago. I recently started antibiotics. antibiotics can counter act with birth control, but only as I’m taking the antibiotics right? if I was not on them when we had sex, I can’t get pregnant from that sex 4 days ago? it is only if I were to have sex while currently on antibiotics?

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