Why do I have to pee so much?

Okay, kind of awkward but, I have to pee a lot. I'm trying to drink more water so, I'm drinking about 3 or 4 bottles of water every day. Which is equal to about 6-8 glasses of water. I'm still drinking soda too, I'm trying to cut back slowly. lol Tonight though, I've literally been up and down all night peeing. I'm not sure if it's all the water or the fact that my period is really soon. I usually pee more around "this time of the month." I was also pretty bloated yesterday. Do you think it's from the bloating or all the water? A combination of the both?