I hear you can lose it and it will rebuild.. I think as long as there was no blood or it wasn't pink you should be good. If you start feeling contractions I would call your doctor.
I had the same thing last week and I'm 29 wks now. I asked my doctor about it and he checked me but no changes...said its normal to lose it a little at a time and also for your discharge to change in the last trimester. As Aliciaw said go in if there's blood or contractions, mention to your doc next visit. And smile....we're going to meet our lil ones in around 10 wks!!!