Just keep checking on it throughout the day. I doubt you got many clicks from this forum (I looked at it and didn't click on any ads) but if the other forums you sent it to were related to money making ideas like your blog I could see a lot of those people clicking on some ads because you are getting good relevant advertising. If you are well known in that kind of forum people may be more likely to check out your site for a while. I'm guessing that after a while your ctr will go down some because now the visits are probably coming more from the social sites and related forums and those same people may not keep going to the site or may keep going to the site but be less likely to click on ads the 2nd or 3rd time they go to it.
See how traffic and clicks look after a few more days and probably they will drop somewhat or level off