Antibiotics and yeast infections

I am currently suffering with sinus problems and tooth pain. I am taking penicillin (which I hate). I am going on a trip in 2 days and I just started taking the penicillin for 2 days now. I am worried about getting a yeast infection, not only because they are horrible, but because I will be traveling for a week. I am so confused as to what I should do. Should I continue the penicillin hoping that the sinus/tooth pain subsides and try to not worry or obbsess about getting a yeast infection or should I discontinue the antibiotic and stay safe? I'm not sure if the penicillin is helping anyway, but I'm more worried about a yeast infection. What should I do? I just want to be healthy and pain free but I'm not sure what the best way to do that is.

I am on the pill and I have taken the penicillin in July and everything seemed to be fine. Maybe it's just my overactive imagination or my worring but my vaginal area does seem to feel a little burny. I've only been taking the antibiotic for 2 days now. Should I stop and hope for the best or just keep taking it and worry to death? I haven't been able to take a trip in 3 years and I really want to enjoy myself AND feel good. What is the best thing to do?