The pill (inc low dose ones) are the same as any medication, they can cause all sorts of side effects (good & bad), clear up or cause acne, gain or lose weight(we almost lost our daughter after her only being on the pill for 4 months due to the side effects it had on her, massive weight loss & huge decrease in brain chemicals that control or keep under control, stress - she got down to 32.2 kg about 75lbs!!).
I also know a number of women who have become infertile or had alotof trouble falling pregnant after being on the pill, again in some cases at least they were on low dose pills for short time periods.
Just be careful & don't assume anything is safe.