I did know about lochia either! that was a lovely surprise :-S I had a C-section and thought that my catheter was leaking.
I thought i'd have no stretch marks, HAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!! They go from the tops of my thighs right up to my rib cage.
I thought i'd have a lovely, not very painful because I would relax, birth with no intervention. But baby decided not to move that day so I ended up on the belt for the whole labour, couldn't stay still enough for the traces during contractions so had an epidural, so was lying on my back not being mobile, failure to progress followed by C-section, for which I had a general anaesthetic, lol! So couldn't be more different.
But on a positive note:
I thought that if I had a medicalised birth I would come out traumatised, not bond with my baby and get PND, but I haven't had trace of blues and feel very happy with how it went :-)
I expected my baby to wake constantly during the night and never stop crying, but he is lovely and has slept through from a few weeks old :-D
Nappies aren't anywhere near as stinky as I imagined, but then at the moment he is ebf.