I too found out early. I am 5 weeks today and it has been confirmed by blood tests through out last week. Maybe your doctor could do as mine did and make sure your hcg blood levels are rising, that may put you at ease.
I have a 15 yr old and have had 2 miscarriages so Im nervous too. Im thankful every day I wake up and my boobs are sore and there is no bleeding. Although I do have cramping but they say this is from the uterus growing to get ready for baby.
Good luck and hugs