Sounds like it could IBS to me. Have you been under a lot of stress lately or have anxiety. If you worry about it more that normally makes it worse. I have it and I can tell when I'm stresing out big time.
Most likely its your body adjusting to the pill.
How long have you been on it and which brand?
These symptoms should subside completely after 3 months or so, but if they are very debilitating to your everyday life, you shouldn't have to suffer with it and you should tell your doctor to change the brand of pill, preferably to a lower dose one.