There are a variety of ways to be uncomfortable, and pregnancy will introduce mom to most of them. The first trimester and third are very different in the way discomfort presents. The first trimester, when mom's body hasn't changed as much as her hormone levels, nausea is the main issue.
the third trimester, morning sickness has passed for most women. Discomfort those last three months stems from baby gains, swelling, and back aches. It's a different kind of discomfort, one that feels like a whole-body ache. Both are difficult, but they are unique. The last trimester discomfort helps mom face childbirth because she's just ready to get the baby out of her body.