Is it true that fiber is digestable

The answer is false.

Fiber cannot be digested, as it is made up of plant matter or cellulose.
Cellulous acts like metal in our bodies; out digestive tract was not programmed to break down cellulous. As we evolved, we mostly fed off of meat. The substance acts as a 'cleaner' per say; whenever you eat excess amounts of salad, you will understand what I'm trying to say. The cellulous makes up the structure of your wastes, helping it to flow through your body more easily.

Hope this helps!

Fiber is not digestible. 

The only function that fibre serves is that it can add bulk to our food, thus it can stimulate the movement of our intestines. They tend to increase their size when they absorb water so that it can touch the wall of intestines to stimulate the movements. They're indigestible part of the food.  They cannot be digested therefore there isn't any nutrients or calories for us to absorb. 

However, fibre is necessary in our daily diet, because constipation may occur if we do not have enough fibre intake. 

A. i may be wrong i really don’t know

Hello! i believe that it is okay, but you should limit on how much you go in a jacuzzi, hot tub, sauna etc. the rise in temperature may effect the development of you unborn baby and could cause some birth defects most likely in the first 3 months or 12 weeks of pregnancy. the recommended amount of time to be in a jacuzzi while pregnant would be 10  minutes or less.i hope this !