hg - what to do when hg push times out

UPDATE - I'm probably being daft, see my last update below.

I just did a hg push and it timed out, and now when I try hg push again I get a message 'no changes found', however I can see in the target repo that all but a few of the changes didn't make it to the repo. How can I push my changes to that repo?

The history behind this is I'm migrating from SVN to Mercurial (bitbucket). I've done the following:

• Used svnsync to get a local copy of the SVN repository.
• Created a new repo within bitbucket
• Cloned the repo to my local machine
• Done svnadmin convert from my local SVN repo to my local Hg repo
• Run hg push to push the changes to bitbucket

The last command prompts me for HTTP authorisation, then says 'searching for changes', no output for >15 mins, then output 'abort: HTTP Error 504: Gateway Time-out'. Full process was:

C:\dev\sandbox\svn开发者_开发技巧_to_hg\dev_hg>hg push
http authorization required
realm: Bitbucket.org HTTP
user: my_login
password:
pushing to https://bitbucket.org/my_login/dev
searching for changes
abort: HTTP Error 504: Gateway Time-out

C:\dev\sandbox\svn_to_hg\dev_hg>hg push
http authorization required
realm: Bitbucket.org HTTP
user: my_login
password:
pushing to https://bitbucket.org/my_login/dev
searching for changes
no changes found

It seems that because there are so many changes it's taking too long between HTTP auth and when it actually pushes the changes, or something like that, and probably if I set up SSH keys it'd not need to cache the HTTP authentication so it wouldn't time out. Any ideas if that's correct? Regardless, I still need to know how to push these changes that hg now thinks have already been pushed.

In my bitbucket repository there are about 20 changesets from SVN from a few years ago, but there should be several thousand.

UPDATE:

hg out gives me this:

C:\dev\sandbox\svn_to_hg\dev_hg>hg out
http authorization required
realm: Bitbucket.org HTTP
user: my_login
password:
comparing with https://bitbucket.org/my_login/dev
searching for changes
no changes found

Looking at the repo using TortoiseHg repo browser shows there is tons of stuff there.

UPDATE:

Perhaps I'm being daft, now when I look at the repo within bitbucket it does seem that there are lots of changesets. But what timed out? Should I worry that all my changesets didn't make it to the server?

It seems that all changesets did make it - i.e. answer is to retry and then trust Mercurial.