What should I do if I'm still constipated after increasing my fiber intake?

Increase water. Fibre needs an increase in water a fluid intake to be more full effective. One can also add MiraLAX (polyethylene glycol) once a day.
Fluids and Softeners. Increase your fluid intake. Also using stool softeners is very helpful. Most prescription prenatal vitamins have a little bit of a softerner in it, but most pregnant women need more.