Thanks for writing to us.
Mild bleeding during the pregnancy
at 21 weeks is likely to be due to palcental abruption. If your ultrasound
scan is normal with no detectable retroplacental clots then there is nothing to be worried about. Irregular uterine contractions can sometimes cause such a bleeding.
You need to have an absolute bed rest
till the bleeding and uterine contractions stop completely.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal