it's prolly a scam. do NOT click on any link in that email!!
just go to www.ebay.com and log in the normal way, that's the best way to find out. check your messg. in there, too.
good luck!
edit/// sorry, didn't see the top part of your post, i guess! if you've logged in the normal way and it's fine, then it is a scam. forward to spoof@ebay.com