Thanks for your query,
It seems you are right. this type of symptoms may occur due to miscarriage
. Severe lower abdominal pain and bleeding may be a sign of misscarriage . Even ectopic pregnancy
is possible as you had fainting
In your case a USG will be needed to confirm the diagnosis. I suggest you to meet your OBG as soon as possible.
Take care and best of luck.
Hope it helps you..