I came online to research about this exact thing, because it just happened to myself as well. I've been on the pill for about 5 years now, and got off of it a month ago-- wanting to give my system a break while my husband was deployed for a few months. I've never experienced any itching or burning or pain, so I assume it's not a sign of infection... and it's about the perfect time in my cycle for ovulation, so I'd imagine that this is what it is. I'm thankful for this site, though-- definitely glad I found the answer.