Braxton Hick Contractions at 24 weeks

I woke up this morning after sleeping horribly.  I literally woke up every hour....oh well that's normal for me now.  My husband had just come home from morning PT and I was fixing us breakfast.  All of a sudden I had a horrible cramp, very similar to a menestral cramp.  I would say that it lasted around 20 seconds before it stopped.  I am wondering if this was a Braxton Hick's contraction? 

I know that it's very common to have these during pregnancy.  I looked up online just to make sure it wasn't anything to be concern about.  I read that as long as you don't have 4 or more within an hour or bleeding it's okay.  This was such a huge relief for me to know.  The day is halfway over and I haven't had another one.

So for any women out there that may experience this, it's okay and there is no need to worry.  I would recommend educating yourself on early signs of premature birth especially if you are high risk like myself.  In my case, it is a real possibility that I might deliver early.  I have already read up on many of the signs.  Education is the key.  :)