Yeast infection or just not being use to having sex?

Okay, so me and my boyfriend have been on like a sex kick. We fucked on Christmas <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and a few times last week. My vagina burns, itches, and is very irritated. Is it a yeast infection? Or am I just not use to having sex so much in a few weeks? 🙃