Hello, thanks for your time. I took Plan B 2 weeks ago, everything was fine, had some light bleeding approx. 2-3 days after taking the medication for about 2 days. I had to take the pill again about 4 days ago, and the day after I took it I felt like I had a terrible yeast infection coming on. It has gotten progressively worse, but nothing different from what I have felt with yeast infections in the past. I heard the opinion that I may have thrown off my vaginal pH? Am also scared of the possibility of STDs. Please help!