thesameboat (no login) Posted Jul 27, 2012 7:03 PM
It doesn't really have anything to do with whether you're doing a natural cycle FET or not. The antibiotics are for if you have some sort of infection that might make your uterus an unfriendly place for the embryos.
I had 6 transfers, 4 of them DE, before anyone thought to test my BLOOD for chlamydia instead of just doing the vaginal swabs. Sure enough, the vaginal swabs had always been negative, but I have fluctuating levels of antibodies in my blood indicating that I do have the infection somewhere higher up in my uterus. I have to take a broadbase antibiotic for transfers, starting 3 days before transfer and ending 3 days after.
If you don't have any sort of infection, the antibiotics won't do anything for you, though.