21 days post covid symptoms, im having stomach pains all over and goes to my ride side of my back. i did miss my period because of covid. is this something to worry about?

Persistent abdominal pain is always concerning and warrants an examination by a physician,surgeon or gynecologist. . Possibilities here include appendicitis, gall bladder inflammation, kidney stones, pelvic organ pathology. Being seen in the hospital emergency room may be best as prompt evaluation & testing are available.

Agree with Dr. Colantino. If you had sex since your last period, do a home pregnancy test. Wish you good health!