Was the vaginal bleeding a light spotting or was it obvious bleeding? If it is spotting, please relax. Nothing to worry, it will subside in a day. If it is continuous and frank bleeding, you may get back to your doctor at the earliest.
I understand that it is your first pregnancy; you need to be careful. However, at this point, I do not think there is anything serious with you.
Take adequate bed rest
and consume more fluids orally.
I wish you quick recovery.