I read your query with great interest. Thanks for sharing your concern.
My suggestion to you:
Please go to the ER if you are unable to get to your doctor's office at the earliest.
In the ER, you may request for an ultrasound
scan. Let an internist examine you. I am sure, the examining doctor will be able to rightly judge what is going on inside.
I understand this is your first pregnancy
and it is precious. You are definitely not paranoid.
Please follow my suggestions. Wish you happy motherhood!