Firstly, no not every woman gets pregnancy related nausea and vomiting. Around 70% will get nausea and/or vomiting, which means 30% get neither. A huge number get nausea but never any vomiting or only one vomit ever. So definitely not inevitable!
My mum had none in one pregnancy and only occasional nausea in the other. Personally, I'm 9 weeks and have had only v v little faint occasional nausea. Do you know what your mums pregnancies were like?
If you were to get high levels of nausea or vomiting, there are drugs that can safely reduce these symptoms. There are also ways of eating that will reduce nausea.
All pregnancy symptoms also come and go, so it is important not to think "oh god I'll have this every day now" or "my symptoms have gone, something is wrong".
Lastly, if you do get nausea it typically lasts week 6-12. For some women week 6-16.
It might be helpful for you to work out what actions you would take if it were to happen. Eg "if I start to feel nausea, I will eat in this way". "If I were to start to be physically sick I will talk to my GP".
Hope this helps @maudesid