dianette contraceptive pill during breastfeeding

My son is now 8weeks old and i have breastfed him since he was born with no problems. However, from a recent visit to my doctors I was prescribed dianette contraceptive tablets. trusting my doctor I have been taking them for 7days now...I only read the leaflet today and have realised that you are NOT supposed to take dianette during breastfeeding! i am very worried...even though I have stopped taking the tablets now...will it still affect my breastmilk? has anyone been in this situation?

any advice or reassurance would be reatly appreciated, thank u xx