my 2nd pregnancy was so different to my 1st as well..

With DD, I was sick all the time till about 15 weeks, (work found out at 7 weeks cause I would be in the toilets a few times a day, LOL), then I went on to have a smooth pg with the occasional high BP reading (always after a hectic commute though).

With DS, nothing. If I hadn't done a POAS and had scans, I would never have known I was preg till my indigestion started and DS engaged from about 27 weeks.. (well I had a bump, but none of the common pregnancy ailments)..

I am sure that it is just a different pg for you.