Scratching solves two problems. One of them, is the scratch and another is that it allows us to go through the cervix. Sometimes we do the hysteroscopy. When we have the problem to do the scratching with a special catheter to the uterus, we perform hysteroscopy and to find a way where it goes. Sometimes it’s going more to the left, sometimes it’s going more to the right. When we do the hysteroscopy, we can find out how it goes and it allows us to go with the catheter this way. The contractions – when we perform the embryo transfer, we try not to touch the fondues, to do it as smoothly as we can, we use a very delicate catheter because we do not want to have the contractions. We do not want to cause any pain to our patients because we believe that it can diminish the probability of success. We sometimes have to struggle as well. Sometimes we have the problem with the transfer and, even though, we always try to make it a smooth as possible, you should remember that this is medicine and sometimes it’s difficult or even impossible to know something beforehand.