You might be experiencing lactational ammenorrhoea i.e due to hormonal
changes occuring with breastfeeding
the women may not have periods.But sometimes its possible that ovulation starts even without menses so contraception
is advisable even if you are ammenorrhic.
is lipid lowering agent and is usually not prescribed to pregnant and lactating females as it may harm the baby, its safety being not proved by research yet.
Ecosprin (aspirin) a salicylate also is usually contraindicated in lactation unless absolutely necessary since if taken in higher regular doses as prescribed for arthritis
, it may harm the baby.
Please consult your physician and discuss the matter.If absolutely required for you then you may wean your baby from breast milk as she is already 15 mths old.If not, and the drugs can be stopped or changed then you may continue breastfeeding as per maternal and babys wish till about 2 yrs of age .
Hope I have answered your query.