Abdominal pain is an acute condition; therefore you need an emergency medical aid. Virtual diagnostic of pain is a tricky and risky staff, because besides of the Likert scale of 0-10 and pain patters (pulsating, monotone, sudden, rapid, gradual), it is essential to examine the habitus of the patient (pale skin, stria, dilated pupils, "buffalo hump," type of breathing [thoracic, abdominal], etc). Given your verbal description, the RLQ pain irradiating to the vagina without any stimulant may refer to the number of conditions listed below. But before observing the list, it is central to determine any linkage of the pain to:

(a) dyspareunia (painful sexual intercourse)

(b) phrenicus symptom - in order to determine the internal jugular vein involvement (as the pain is in the right) to rule-in or rule-out the cholecistitis and cholestasis

(c) intake of uncoated aspirin or high arterial pressure medications

(d) Presence of Pirogov sign (when moving the right hip to toward the abdomen, or laying down on left side intensifies the pain) to rule-in appendicitis

(e) possibility of food intoxication

(f) possibility of bowel obstruction with helminthiasis.

Please, follow the list of possible female conditions that require an immediate care. The checking routine includes bimanual exam, sonography, WBC (white blood cell count), and CRP (c-reactive protein).

1) uterine myoma (unlikely in your age, 18)

2) strangulated ovarian cyst

3) ectopic pregnancy

4) external endometriosis (rare in your age)

5) miscarriage

6) IUD complications (unlikely in your age)

7) others.

Please seek an immediate medical care.