Probably relube your chain and check the chain for rust. If your bottom bracket was under water, you might want to pay very careful attention to it.
Sounds like you have been bitten by the bug!!! Your profile doesn't say where you live, but are you aware that riding muddy trails can be very destructive to them? Not try to slam you, just hoping for education. Every community has different attitudes towards this. You might check with your local club about their suggestions for how many days to wait for things to dry out when it's "crisco like mud". I know when conditions are really goopy around here, it's tough to have to wait it out until the trails are ready.
congrats on breaking the new bike in properly - on the dirt!!