I did my last FET by myself

Well sort of. My DH waited in the car with our other kids. It was fine really and ultimately a success. I would have left him at home but my RE insisted someone drive me after the transfer as they give you Valium. I figured he was there with me physically (at least his sperm was) and he was definitely thinking about me at the time. Unless you are really scared or something, I think you will be fine.