It is not unusual for progesterone only pills to cause irregular bleeding as you describe. This often improves after a few months of use. You have a number of options:
1) To continue the Cerazette for another month to see if things improve – about 40% of women have spotting the first month. For 50% of these, things improve the second month
2) To ask to switch to Femulen, which is also a progesterone only pill but is made of a different progesterone. Sometimes women who experience bleeding with one experience less bleeding with the other. This drug has been available intermittently over the last few months, but you can try.
3) To use a combination estrogen-progesterone pill. These formulations generally cause less spotting/bleeding than progesterone alone. Their use during breastfeeding has not been found to put the infant at risk and the American Academy of Pediatrics considers them compatible with breastfeeding. They can reduce the milk supply in some women. However, in a two year old who also eats other food, this situation can generally be handled well. One can often counteract the decrease by increasing the frequency of nursing or pumping. Any remaining dip in milk supply can be filled in by the solid foods that a two year old will be eating anyway.
4) You can also see if it is logistically possible for you to get the drug that you were using in the US brought to you here by a friend or family member.
With any use of hormones, make sure to review the rules of ketamim to be sure to know which stains are problematic and which are not.