pip the embryo hatch around day 6 and try to implant from that point until, so that could be implantation bleeding. That's the same whether the first few days are in you or in the lab. As stars said though, they keep burrowing in for a while . I had a bit of bleeding on my first cycle at 15dpec- a few days after I had had a positive test.
There is a whole big thread on sex/orgasms in the 2ww on fertility friends. Some clinics don't advise either way (including mine). Some say to avoid. There doesn't seem to be much on the way of consensus either way. As I mentioned on the last thread, there is an immune theory that having the father's swimmers in there at implantation time is a good thing.
I was just told no hot stuff (saunas, hot baths), no swimming in the days immediately after (I assume for infection risk), no strenuous exercise by my clinic. Nothing about sexy time.
stars I had forgotten about your temp. I think that could well be the problem. With 5 blasts something should have stuck, so I reckon the fever did for them. What unlucky timing.
Congrats on being PUPO, marypops!
Welcome deelia. I think we are all on various stages of the IVF "journey" on the thread, but as far as I'm concerned the more the merrier.