Period and alcohol

[anyhow]

So within the last half a year, whenever I drink heavily (and it seems to happened espesualy when i also have smoked weed) the next day i seem to get my period just for a couple hours. Every time this happens, and I drink heavily usually once a weekend, but even the times that I've gone several weekends without doing so, when i do drink heavily again, sure enough the next day I'm bleeding. It's a little worrisome. any ideas?

[Pandamonium]

Removing this since there is a duplicate.