Spotting, 9 weeks five days

Hi all,
I am 9.5 weeks pregnant now... From yesterday I am noticing discharge with blood... It's not visible on my underwear but can see it when I rub with a toilet paper... Went to the doctor and he has given to take few tests and asked me to come back next week... But I am scared as hell, as the doctor says that my baby has not grown to the expected measurements as a nine weeks past fetus... However he said that he will check me the next week accompanied with few blood tests... I am very much worried... Is spotting normal and how many days will it last...?? This is my first pregnancy and I do not want to face any negative consequences... Has anyone else experienced the same situations and yet had normal pregnancy till the end and a healthy baby?? Plz share... I really want to know....