hi and welcome to the forum
as a non-parent ms patient and a nutrition activist, over the years I have been on this forum I have dealt with more than one mom with ms or fears of ms.
I think a huge part of the reason pregnancy is protective against ms is the prenatal vitamins expecting moms take. and I think the reason people relapse after, is that they stop taking them.
to take just one fundamental nutrient out of a large interconnected picture, zinc is fundamental to fertility and fetal development, and childhood development in general. that is a tiny fraction of its importance but relevant here.
zinc is in high demand when moms are building new human lives. zinc levels have been demonstrated in research to decrease over the course of pregnancy even when taking supplements.
zinc is also known to be low-normal in ms patients vs high-normal in healthy people. having low zinc levels affects the ability to absorb/utilize many other nutrients that are known to be problematic for ms patients, including magnesium, vitamin b12 and vitamin d3. low zinc can also be linked up with a variety of problems experienced by ms patients.
here is a story you might find interesting, of a mom who came here fearing she might have ms based on her symptoms. she follows nutrient advice and feels better, then listens to her doc who recommends fewer nutrients and feels worse, then is encouraged here to return to higher doses of nutrients and feels better, finally coming back online later to check in and say thanks again, all better now. general-discussion-f1/topic19575.html
there may be all kinds of things to be done to address your current fatigue, if you would like to follow up just say
this link details my nutritional approach to msregimens-f22/topic2489.html