Are pregnancies with two or more babies the most difficult ones?

This is my 2nd pregnancy (I'm on my 20th week) and it's with identical girls. Unlike my first pregnancy, this one has been giving me trouble from the beginning. I presented morning sickness and all the other symptoms, including leg cramp, acid reflux, sleep problems too. I just hope all this goes away soon. I'll try to see if I can opt for a vaginal birth again.

My 1st pregnancy (a singleton, baby boy) was easy and had no symptoms except catching a cold once. That was the best pregnancy experience ever. With this one, not so much.

This is my 1st experience with a twin pregnancy, even though there aren't any twins in the family. Are pregnancies with two or more babies the most difficult ones?

Are pregnancies with two or more babies the most difficult ones?
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