"i&#039;ve been taking the pills for 4 months now. i was using  the mirena for 7years prior. pros: no pregnancy,very light menstrual cycle, and no spotting. cons: 1 st month pregnancy symptoms, ongoing: increase appetite,  bigger breast with sore to touch, and headache from time to time. if you can control your diet and exercise the weight gain won&#039;t occur or would be more manageable."