Ready, but Timing?

So I really like this guy and I've been saving my virginity for a really long time. And I know its right.however, because he is 3 hours away the only time to do it is New Years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> (bc thats when we see each other next). But my period ends the day after Christmas. The only form of birth control we have is a condom. Is it safe? Should I do it? Will I be in my fertile window?