Scared & Nervous! Please Help!

Stephanie
Im 13 weeks & one day! So I just had my 1st Trimester Screening at the Hospital & Baby was jumping around and ultrasound tech said everything looked great, I just got home and felt something what i thought was possibly discharge so i went to the bathroom and wiped and it was BROWN DISCHARGE, like spotting...... Should i be worried (because i am) Should i run to the ER? I called my doctor im waiting on her call in the meantime i cant just sit around. Waiting to see if it continues..... Super scared 😔😔😔😔😔