The general rule is to wait up to two weeks after the embryo transfer before having sex. Some couples forego these recommendations and do it.
The other time intercourse may be discouraged is following an embryo transfer during an IVF cycle. This period referred to as “pelvic rest” is recommended anywhere from 5 days to 2 weeks after transfer – once a pregnancy test may be reliably administered.
Please note, there is no proof that having sex after embryo transfer in IVF interferes with the embryos that have been transferred. – thus if you are feeling like it, go ahead!