2006 Honda Civic Bad Clutch

I have an 06 Honda Civic with 70,000, much of them highway miles. I've noticed within the last year the car will shudder once in awhile when starting out on a hill. I bought this car brand new, and I certainly don't beat on it. I'm not sure if I'm letting the clutch out too fast, but I can drive a manual transmission fairly well. When I get the car serviced, the clutch is always something on the complimentary check, and they always check it as OK. Does this slippage mean I will need to replace the clutch?