You might have some of the same twin pregnancy symptoms you had during earlier weeks, but you may have some new ones. At 20 weeks, you may also be showing a bit more since your uterus is now at or above the level of your belly button.
Most women can feel fetal movement by 20 weeks, though you don’t have to worry if you haven’t noticed movement yet. Movements sometimes feel like gas or “fluttering” at first and might take some time for you to recognize it as your babies move around. As your pregnancy progresses, the movements will fill more like jabs or kicks.
If you have anemia, it means there are low levels of red blood cells in the bloodstream. Red blood cells are important because they carry oxygen to your organs so if you're anemic, you may feel tired and weak. Some women become anemic during pregnancy, and it’s even more common in twin pregnancies. There are several causes of anemia during pregnancy. Physiological anemia is the most common cause, and it happens because of normal pregnancy changes in the blood.
Lack of iron is another reason some women become anemic during pregnancy since iron is needed to make new red blood cells. Your provider may recommend an iron supplement, but you can also get iron naturally by eating foods like spinach, beans, and beef. Vitamin C-rich foods, such as oranges and tomatoes, help your body absorb iron better, so it’s a good idea to eat more of those foods as well.
Discomforts of pregnancy aside, you may find that you actually have a heightened libido during pregnancy (especially during this time) thanks to the increase in hormones. In addition, you also have an increased amount of blood flow to your pelvic region, which can contribute to an increase in sexual pleasure and sex drive. But don't worry if you don't have an increased sex drive. Some women actually report lower libido around this time, too.
During pregnancy, hormones can have an effect on the skin pigment melanin. Some pregnant women get a skin change called melasma on their face, which is a blotchy, darkened pigment, or you may also have a dark line, called a linea nigra, develop down the middle of your abdomen. Your areolas, the skin around your nipples, might get darker as well.
Source:
. https://www.babycenter.com/pregnancy/your-baby/fraternal-twins-in-the-womb-20-weeks_3651561