Hello
Welcome to health care magic.
UPT has less sensitivity to detect
pregnancy.
Better get your blood tested for level of
HCG in blood to confirm pregnancy.
If you are positive,you may talk with your doctor about discontinuing tab
deviry.
If pregnancy is not there,delay in periods with abdominal and lower
back pain may be because of
pelvic inflammatory disease.
Do you also experience vaginal discharge/burning sensation in vagina during micturation or sex?
You need to visit gynaecologist for proper pelvic examination.
Vaginal swab microscopy smear examination and urinanalysis may be needed to identify cause of pelvic inflammatory disease.
It can be managed by a course of antibiotics like cipro/azithro for 7-10 days.
It can be sexually transmitted so avoid sex while on treatment.Also get your partner treated.
Maintain regular genital hygiene with soap and water.
Drink adequate quantity of water.
Hope this information helps.
Any more query is welcome.