How can i avoid constipation on the first day of my period and pms i find no matter how much water i drink i still get constipated before my period starts and on the first or second day of my period what can i do to fix it?

Constipation: If you get no urge at all for a bowel movement on those days, and your diet includes good amounts of fiber from fruits, vegetables, you could take a gentle bowel stimulant like senokotS .for a few days in advance of your period. If you have urge but can't move your bowels, insert a glycerin or dulcolax rectal suppository to unload stool.