Thanks for posting your query.
There are two prominent possibilities-
You may be having an ectopic pregnancy
that might have ruptured or just stretching the adnexa.
You may be having a threatened abortion
In both the scenarios the patient must be in the hospital. An ultrasound
is a gold standard investigation to detect either and an apt Gynecologist the best person to handle the problem.
I hope the advise would be immensely fruitful for you.