"before being on birth control, i had light bleeding, but terrible, painful cramps, and i started experiencing migraine headaches from my periods. the first bc that my doctor put me on i immediately started having worst abdominal cramping that i ever felt. so, after six months, she switched me to low-ogestrel 28, the first month was fine, but now i&#039;m experiencing abdominal cramping again, and a little light headedness during the intense cramping, i take the pill in the morning, and the cramping happens, usually at night. i also think that its messing up my gi tract, because i&#039;m experiencing upset stomach &amp; diarrhea issues that i have never experienced before, i definitely will be switching to something else."