Awoman who is 20 weeks pregnant is expected to experience

You’re in the middle of your second trimester. Your appetite is likely back to normal, or it has increased. While nausea and fatigue may have disappeared during your second trimester, by week 20 of your pregnancy some symptoms you may experience or continue experiencing include:

body aches
stretch marks
skin pigmentation

Other symptoms you may be experiencing include: Food cravings, Braxton-Hicks contractions (or false labor)

Source: healthline.com

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.