Each case should be taken individually. 2nd baby - a breeze. 1st baby - I had constant sickness at any time of day, carpal tunnel syndrome, the bit that softens to let the baby out softened too early which made it impossible to walk, I have thankfully forgotten the rest. I would say that yes, I was ill throughout my entire pregnancy, right from when I threw up while on a Ferris wheel (I wasn't popular and was accused of being drunk) - something I usually love. Oh, and I fainted while out shopping. Three times.
My point is - if you were
continually sick for eight months
couldn't use your hands and had to sleep with them up above your head all night
kept fainting
were in constant pain when walking
You would be considered ill. But oh no, you are 'only' pregnant and aren't even allowed to take a pain killer or cold cure.