Hallow Dear, There are varied types of birth control pills. Some contain low progesterone and high oestrogen, some are balanced while others are low oestrogen and progesterone dominant pills. I do not want to bother you with the continuous and sequential and such types of pills. Generally, the women who are having oestrogen dominance should take progesterone dominant pills, those with Progesterone dominance should prefer Oestrogen dominant pills while the balanced women may take any type of pills. Oestrogen dominant girls are usually short statured, having gorgeous breasts and their menses are heavier; while Progesterone dominant girls are taller with smaller breasts and have lighter menstrual cycles. You can decide about your hormonal balance and accordingly choose the pills. Any pills you take, they do increase weight due to water retention. Also there is some fat deposition as these hormones are cholesterol based. With restriction on salt and dietary fat intake, you can control the weight gain. Break through bleeding usually is more common in Progesterone dominant pills; however, any pills may cause it. It is not an issue and can be controlled just by taking an additional pill. I feel you should have little more positive view towards birth control pills. The pills do get adjusted to the body eventually. I hope this helps you. Dr. Nishikant Shrotri