Prednisone and antihistamine protocol for FET

Hi there,

I am gearing up for my third attempt at an embryo transfer (first two were fresh, this will be my first frozen). My doctor has recommended adding a daily steroid (prednisone), a blood thinner injectable, Claritin and Pepcid AC daily given I do not have an actual infertility diagnosis and there is a possibility my issue is with my immune system rejecting the embryo. Has anyone done this or a similar protocol and had success?