Suggest Suitable Medication To Prevent Pregnancy

Hi, I have a 10 month old kid and my wife is breast feeding. earlier this month, my wife started taking cerazette and after taking it for 10 days or so, she stopped because of excessive bleeding. Now, the bleeding has stopped and she doesnt take any pills. However, when we had sex yesterday with protection, we are fearing that there might have been some accident. IS it recommended to take the Cerazette pill now or any other pill tobe sure that she doesnt get pregnant now. please advise.