I have pms. i noticed this & was wondering. is there a difference between bloating and weight gain? i look bigger, but weight is the same.

Bloating vs wt gain: Check out http://www.healthline.com/symptom/abdominal-bloating & http://www.mayoclinic.org/diseases-conditions/gas-and-gas-pains/in-depth/gas-and-gas-pains/art-20044739 re bloating, which doesn't necessarily affect your weight. However, your weight may fluctuate in response to hormone cycles which may be explained by fluid retention aka edema. Birth control pills can be used to treat/prevent PMS.