Fluid in uterus prior to transfer?


Hi ladies,
I had my ER on Friday and they noticed there was mucus/fluid in my uterus. This happened during my first IVF cycle as well but it had resolved by the day of transfer. RE said there was nothing they knew of to get rid of the fluid, but I wondered if you all had any thoughts? My transfer is supposed to be tomorrow (3d), but they can’t transfer if there’s fluid because it’s like “putting embies in a bowl of water” and they won’t implant. This is totally TMI, but prior to transfer last time, I did have an O, b/c I figured if it caused uterine contractions, it might expel the fluid, which may have worked. Any other thoughts?? Thanks!