It is still important to keep drinking your water.
It is quite normal to want to pee more before a period starts. This is to do with the hormones releasing fluid retention.
If you do experience wanting to pee a lot at other times, this can sometimes be from a urine infection or from anxiety.
Just started about a few days
could be a UTI, or overactive bladder syndrome. how long has this been going on?
does it burn when you pee?