Will the antibiotic flucloxacillin make my contraceptive pill ineffective?

It is best to: Use backup method for the rest of the month, at your age if you do not want children, i would offer you an in office tubal sterilization , takes 5 minutes, is easy and safe, and you should be on the lowest dose of pills if no problems which is loloestrin- less chance of blood clots, etc. And after the tubal if you want no more periods, would do in office endometrial ablation takes 8 minutes.