Goodafternoon doctor, why am i heavily bleeding...

What are the possible causes of lower abdominal pain and abnormal vaginal bleeding ?
Injury to the vagina during sexual intercourse
Cervical inflammation
Chlamydia, or gonorrhea
uterine fibroids, uterine or cervical tumors, or abnormal tissue growth in the uterus
Stress
Changes in hormone levels, possibly as a thyroid problem
Start or stop the OC pill
blood thinners
Ectopic pregnancy, abortion or other pregnancy complications
Cervical biopsy or other similar procedures in the genital area
What are the necessary tests?
Clinical examination
Full blood test
Examination of vaginal area and uterus
Ultrasonic examination of the abdomen and pelvis
Pap smear
What is the treatment ?
the treatment depends on the cause. You should visit the obstetrician and gynecologist to make a full assessment of your condition , you can take naproxen 500mg

Well ovarian cyst more than 3 cm by 3 cm can cause miscarriage especially if there is irregular menstrual period