Can one prepone the periods?

Is there any way to prepone the menses (periods)? Will it affect the pregnancy in any way? I need to prepone periods for a family function.

 

One can prepone the periods by taking micronised progesterone such as uterogeston, susten etc. But this can cause break through bleeding, although it does not harm if pregnancy occurs. I therefore advise that it is better to leave it as such.