It's not your imagination. During pregnancy, it's quite common to experience increased vaginal discharge.
Most causes are fairly benign and normal.
The flow generally increases as you approach labor and can be quite heavy. In fact, an increase and thickening in your discharge towards the end of pregnancy can be a sign of prelabor. Add your comments to the bottom of this page. If your discharge changes, pay attention. If it is foul-smelling, thick, yellow, green, or causes itching or burning, it could be a sign of a yeast or other infection.