Hi, thanks for using health care magic.
You told taking treatment for kidney infection
during that time u had sexual intercourse. the cause for ur problems could be pelvic inflammatory disease
means infection of the genital organs that is why ur getting fever , frequent urination
and this could be the cause for ur loss of period .
For this please undergo ultrasound
of abdomen and urine culture , last but least urine pregnancy test , after confirmation with scan u can go for higher antibiotics .