Aiyoh, this is definitely a doctor question lah, especially since you're still breastfeeding, the hormones can affect things differently and not all pills are suitable when nursing, you know? Better to talk to your gynae or clinic doctor about which type suits you best (some focus on minimal weight gain, some try to keep your cycle regular) because they'll know your health history. A few of my mum friends here went with the mini pill or non-hormonal options specifically to avoid the side effects you're worried about, but honestly each person's body responds so differently lah!