Can one prepone the periods?

Q: 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.

A: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.