how do I get my period to come early???

I just wanted to know if there was a way of bringing on your period earlier than when it's due. I'm in a long distance relationship and will be going to see my boyfriend next week but on day 3 my period is due! It's too late to go on the pill to delay it so was just wondering if there was something I could do to make it come earlier so that it doesn't take away a week of the "fun times".