Yes because your iron is low.
And you will loose a lot of bloody after birth which will make it worse.
Be careful though cos the ones they prescribe can cause some constipation and they turn your stools...well, lets just say they alter your stools.
I think there are some which you can buy over the counter which are better (on the bowel). Can't remember the name though. I am sure someone will be along that can.
You should take it with orange juice I think to aid absorbtion.