Bleeding after abdominal ultrasound

Holly • 22 years old from Alabama. I have been married to my wonderful husband since Sept. 2012. We have a daughter. Our family was completed when our Son was born in November 2015.
I had an abdominal ultrasound yesterday, and everything was fine. This morning I woke up around 3 am and went to the bathroom and everything was fine. I got up again at 7 to go back to the bathroom, and when I wiped, there was a good bit of pink blood and discharge. Is this something I need togo to the doctor about our had this happened to anyone else? I'm kind of worried