We do not know for sure if this procedure increases the chance of having a baby. The theory is that the healing process following a scratch produces certain inflammatory chemicals and hormones.  The substances promote better development of the lining of the uterus and make the endometrium more receptive to an implanting embryo.
However, studies into the effect of endometrial scratch have not shown a clear benefit. In 2021, a meta-analysis was performed of eight studies into endometrial scratch. In this type of research, the results of all the studies are combined and analysed together. The results suggest that, if the chance of having a baby from IVF is usually about 27%, then the chance of having a baby when using endometrial scratch before IVF would be somewhere between, less than 27% and 32%.  This means that the research does not confirm that scratch is of benefit and it does not rule out that it may even harm your chances.