Thanks for the replies, guys. Appreciate it. Nothing was too lose but I tried to tighten up all the screws and bolts but after I rode my bike the noise was still there. I don't think it's coming from the seat. It's definitely coming from the crank area. I hope it's not the BB. I don't know if I should try to take the cranks off, or maybe take it to the shop. I usually like to fix things myself but looks like this time I won't be able to do that.