My ectopic, I didn't have any pregnancy symptoms at all. Two of my miscarriages (the early ones) no morning sickness, no tiredness, etc, etc. Actually, make that three. All of these went before or just on the six weeks mark.
The twins, however, developed normally for a few weeks and then stopped:so I had a few weeks of acute morning sickness and literally feeling too crap to move, just like you'd expect with a standard multiple pregnancy. Belly bloat, etc, etc. The only unusual thing I noticed was that I was cramping a lot at 6 weeks, which I haven't noticed in other pregnancies. There came a point when I realised that I was being noticeably less sick, that my milk supply had risen- my daughter was constantly nursing- but at the same time I felt truly awful and absolutely exhausted, as if someone had flipped a switch and turned a light off inside me. Of course, hindsight is 20/20, but yeah, mama nature gave me plenty of warning.
Then the spotting started on Wednesday, it got to the point of actual blood on the afternoon and I realised I was dilating. It took until Friday night for Brighid to pass, and Bride was born at exactly the same time on Saturday night.