Tight Pants

I'm a little surprised that at just 5 weeks my pants are already getting too tight. Because we are still trying to keep our pregnancy a secret, I've been unbuttoning my pants while I sit at my desk! I don't really think I'm "showing" yet, rather just bloated. I think tomorrow I will go shopping for some larger pants - to tie me over until I get serious about needing maternity clothes. I've read somewhere that Old Navy has first trimester clothes, so I'll try there first. If anyone has any other ideas, please let me know! I'm also happy to say that I really feel pretty good too. I haven't been to sick at all (yet). I have a sort of constant tummy ache, but it's mild. I also seem to be full of gas!