Sometimes on weekends the members have family events, and the forum is a bit slow. I would not be concerned unless she has gone past 67 days. My cat had a bit of discharge off and on for a few days. However, if she starts to have contractions, you should see kittens within an hour- sometimes two hours. Only a vet can tell you definitely, however..
If you are sure she has gone past her due date, or she has had contractions with no results for an extended period, please take her to the vet. I know it's late now, but there is usually an emergency vet open 24 hours or an emergency number to call at most veterinary clinics. I do hope all goes well for mother and babies. Please keep us informed.